d8ff_faec

Three-Point Test Cross Problem

A test cross is a way to explore the relationship between genes and their respective alleles. It is a useful tool for genetic mapping and deciphering the inheritance of traits. Specifically, a three-point test cross examines three (3) genes at the same time to learn about their assortment in gamete formation.

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is analogous to the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene R is connected with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene T is associated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
dewy, rusty, tipsy	d	r	t	374
dewy, rusty	d	r	+	2,498
dewy, tipsy	d	+	t	853
dewy	d	+	+	93
rusty, tipsy	+	r	t	97
rusty	+	r	+	857
tipsy	+	+	t	2,480
wildtype	+	+	+	348
TOTAL =				7,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. drt Incorrect B. dr+ Correct C. d+t Incorrect D. d++ Incorrect E. +rt Incorrect F. +r+ Incorrect G. ++t Correct H. +++ Incorrect MA

b5a8_53ea

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is connected with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene F is connected with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene X is correlated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
bumpy, fuzzy, xanthic	b	f	x	2,306
bumpy, fuzzy	b	f	+	851
bumpy, xanthic	b	+	x	152
bumpy	b	+	+	581
fuzzy, xanthic	+	f	x	550
fuzzy	+	f	+	121
xanthic	+	+	x	826
wildtype	+	+	+	2,413
TOTAL =				7,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bfx Correct B. bf+ Incorrect C. b+x Incorrect D. b++ Incorrect E. +fx Incorrect F. +f+ Incorrect G. ++x Incorrect H. +++ Correct MA

bd94_e972

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is analogous to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene N is linked with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene X is analogous to the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
artsy, nerdy, xanthic	a	n	x	572
artsy, nerdy	a	n	+	28
artsy, xanthic	a	+	x	282
artsy	a	+	+	2,154
nerdy, xanthic	+	n	x	2,106
nerdy	+	n	+	258
xanthic	+	+	x	32
wildtype	+	+	+	568
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. anx Incorrect B. an+ Incorrect C. a+x Incorrect D. a++ Correct E. +nx Correct F. +n+ Incorrect G. ++x Incorrect H. +++ Incorrect MA

35b0_34ac

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene E is correlated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene P is affiliated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene R is linked with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
eery, prickly, rusty	e	p	r	747
eery, prickly	e	p	+	199
eery, rusty	e	+	r	309
eery	e	+	+	67
prickly, rusty	+	p	r	50
prickly	+	p	+	276
rusty	+	+	r	204
wildtype	+	+	+	748
TOTAL =				2,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. epr Correct B. ep+ Incorrect C. e+r Incorrect D. e++ Incorrect E. +pr Incorrect F. +p+ Incorrect G. ++r Incorrect H. +++ Correct MA

86a7_86cc

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is related to the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene J is affiliated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene Y is associated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
chummy, jerky, yucky	c	j	y	44
chummy, jerky	c	j	+	1,336
chummy, yucky	c	+	y	3,098
chummy	c	+	+	138
jerky, yucky	+	j	y	138
jerky	+	j	+	3,066
yucky	+	+	y	1,332
wildtype	+	+	+	48
TOTAL =				9,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. cjy Incorrect B. cj+ Incorrect C. c+y Correct D. c++ Incorrect E. +jy Incorrect F. +j+ Correct G. ++y Incorrect H. +++ Incorrect MA

517e_7c14

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is affiliated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene E is connected with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene K is linked with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
dewy, eery, kidney	d	e	k	1,369
dewy, eery	d	e	+	132
dewy, kidney	d	+	k	19
dewy	d	+	+	472
eery, kidney	+	e	k	488
eery	+	e	+	21
kidney	+	+	k	108
wildtype	+	+	+	1,391
TOTAL =				4,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dek Correct B. de+ Incorrect C. d+k Incorrect D. d++ Incorrect E. +ek Incorrect F. +e+ Incorrect G. ++k Incorrect H. +++ Correct MA

4849_0f64

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene E is connected with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene N is correlated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene W is connected with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
eery, nerdy, waxy	e	n	w	31
eery, nerdy	e	n	+	215
eery, waxy	e	+	w	8
eery	e	+	+	428
nerdy, waxy	+	n	w	404
nerdy	+	n	+	5
waxy	+	+	w	188
wildtype	+	+	+	21
TOTAL =				1,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. enw Incorrect B. en+ Incorrect C. e+w Incorrect D. e++ Correct E. +nw Correct F. +n+ Incorrect G. ++w Incorrect H. +++ Incorrect MA

05d6_29c9

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is analogous to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene M is correlated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene P is associated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
horsey, mushy, prickly	h	m	p	369
horsey, mushy	h	m	+	632
horsey, prickly	h	+	p	66
horsey	h	+	+	20
mushy, prickly	+	m	p	22
mushy	+	m	+	60
prickly	+	+	p	607
wildtype	+	+	+	324
TOTAL =				2,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hmp Incorrect B. hm+ Correct C. h+p Incorrect D. h++ Incorrect E. +mp Incorrect F. +m+ Incorrect G. ++p Correct H. +++ Incorrect MA

9bb6_523c

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene K is connected with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene P is linked with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene X is affiliated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
kidney, prickly, xanthic	k	p	x	885
kidney, prickly	k	p	+	145
kidney, xanthic	k	+	x	557
kidney	k	+	+	3,091
prickly, xanthic	+	p	x	3,113
prickly	+	p	+	571
xanthic	+	+	x	137
wildtype	+	+	+	901
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. kpx Incorrect B. kp+ Incorrect C. k+x Incorrect D. k++ Correct E. +px Correct F. +p+ Incorrect G. ++x Incorrect H. +++ Incorrect MA

edfe_8b49

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is linked with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene J is affiliated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene R is analogous to the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
horsey, jerky, rusty	h	j	r	148
horsey, jerky	h	j	+	974
horsey, rusty	h	+	r	3,230
horsey	h	+	+	566
jerky, rusty	+	j	r	610
jerky	+	j	+	3,238
rusty	+	+	r	888
wildtype	+	+	+	146
TOTAL =				9,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hjr Incorrect B. hj+ Incorrect C. h+r Correct D. h++ Incorrect E. +jr Incorrect F. +j+ Correct G. ++r Incorrect H. +++ Incorrect MA

2831_9f0b

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is linked with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene E is associated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene F is associated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.

Phenotype	Genotypes			Progeny Count
dewy, eery, fuzzy	d	e	f	38
dewy, eery	d	e	+	164
dewy, fuzzy	d	+	f	5
dewy	d	+	+	913
eery, fuzzy	+	e	f	880
eery	+	e	+	6
fuzzy	+	+	f	155
wildtype	+	+	+	39
TOTAL =				2,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. def Incorrect B. de+ Incorrect C. d+f Incorrect D. d++ Correct E. +ef Correct F. +e+ Incorrect G. ++f Incorrect H. +++ Incorrect MA

7fe4_6230

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene J is related to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene X is analogous to the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.
Gene Y is affiliated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
jerky, xanthic, yucky	j	x	y	237
jerky, xanthic	j	x	+	54
jerky, yucky	j	+	y	685
jerky	j	+	+	195
xanthic, yucky	+	x	y	168
xanthic	+	x	+	602
yucky	+	+	y	45
wildtype	+	+	+	214
TOTAL =				2,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. jxy Incorrect B. jx+ Incorrect C. j+y Correct D. j++ Incorrect E. +xy Incorrect F. +x+ Correct G. ++y Incorrect H. +++ Incorrect MA

2df7_ecb4

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is correlated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene W is associated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.
Gene Y is analogous to the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
artsy, waxy, yucky	a	w	y	564
artsy, waxy	a	w	+	2,018
artsy, yucky	a	+	y	202
artsy	a	+	+	60
waxy, yucky	+	w	y	53
waxy	+	w	+	250
yucky	+	+	y	1,937
wildtype	+	+	+	566
TOTAL =				5,650

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. awy Incorrect B. aw+ Correct C. a+y Incorrect D. a++ Incorrect E. +wy Incorrect F. +w+ Incorrect G. ++y Correct H. +++ Incorrect MA

560f_ff10

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is associated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene B is affiliated with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene T is linked with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
artsy, bumpy, tipsy	a	b	t	964
artsy, bumpy	a	b	+	43
artsy, tipsy	a	+	t	2,768
artsy	a	+	+	265
bumpy, tipsy	+	b	t	295
bumpy	+	b	+	2,672
tipsy	+	+	t	37
wildtype	+	+	+	956
TOTAL =				8,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. abt Incorrect B. ab+ Incorrect C. a+t Correct D. a++ Incorrect E. +bt Incorrect F. +b+ Correct G. ++t Incorrect H. +++ Incorrect MA

f1bb_7993

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is associated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene N is correlated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene P is affiliated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
dewy, nerdy, prickly	d	n	p	76
dewy, nerdy	d	n	+	2,971
dewy, prickly	d	+	p	1,118
dewy	d	+	+	649
nerdy, prickly	+	n	p	647
nerdy	+	n	+	1,042
prickly	+	+	p	3,029
wildtype	+	+	+	68
TOTAL =				9,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dnp Incorrect B. dn+ Correct C. d+p Incorrect D. d++ Incorrect E. +np Incorrect F. +n+ Incorrect G. ++p Correct H. +++ Incorrect MA

a6f8_f54a

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is associated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene F is affiliated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene W is affiliated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
dewy, fuzzy, waxy	d	f	w	661
dewy, fuzzy	d	f	+	71
dewy, waxy	d	+	w	218
dewy	d	+	+	1,552
fuzzy, waxy	+	f	w	1,559
fuzzy	+	f	+	241
waxy	+	+	w	82
wildtype	+	+	+	716
TOTAL =				5,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dfw Incorrect B. df+ Incorrect C. d+w Incorrect D. d++ Correct E. +fw Correct F. +f+ Incorrect G. ++w Incorrect H. +++ Incorrect MA

cebf_d8a4

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is related to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene N is connected with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene P is analogous to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
artsy, nerdy, prickly	a	n	p	25
artsy, nerdy	a	n	+	1,163
artsy, prickly	a	+	p	2,839
artsy	a	+	+	626
nerdy, prickly	+	n	p	643
nerdy	+	n	+	2,942
prickly	+	+	p	1,140
wildtype	+	+	+	22
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. anp Incorrect B. an+ Incorrect C. a+p Correct D. a++ Incorrect E. +np Incorrect F. +n+ Correct G. ++p Incorrect H. +++ Incorrect MA

4b14_f459

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is related to the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene H is affiliated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene Y is affiliated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
chummy, horsey, yucky	c	h	y	3,242
chummy, horsey	c	h	+	280
chummy, yucky	c	+	y	18
chummy	c	+	+	403
horsey, yucky	+	h	y	338
horsey	+	h	+	21
yucky	+	+	y	305
wildtype	+	+	+	3,193
TOTAL =				7,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. chy Correct B. ch+ Incorrect C. c+y Incorrect D. c++ Incorrect E. +hy Incorrect F. +h+ Incorrect G. ++y Incorrect H. +++ Correct MA

4e69_a253

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene T is related to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene W is linked with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.
Gene X is related to the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
tipsy, waxy, xanthic	t	w	x	146
tipsy, waxy	t	w	+	356
tipsy, xanthic	t	+	x	2,836
tipsy	t	+	+	1,438
waxy, xanthic	+	w	x	1,382
waxy	+	w	+	2,804
xanthic	+	+	x	302
wildtype	+	+	+	136
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. twx Incorrect B. tw+ Incorrect C. t+x Correct D. t++ Incorrect E. +wx Incorrect F. +w+ Correct G. ++x Incorrect H. +++ Incorrect MA

813d_14f7

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is related to the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene R is affiliated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
dewy, prickly, rusty	d	p	r	388
dewy, prickly	d	p	+	3,255
dewy, rusty	d	+	r	58
dewy	d	+	+	737
prickly, rusty	+	p	r	748
prickly	+	p	+	77
rusty	+	+	r	3,360
wildtype	+	+	+	377
TOTAL =				9,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dpr Incorrect B. dp+ Correct C. d+r Incorrect D. d++ Incorrect E. +pr Incorrect F. +p+ Incorrect G. ++r Correct H. +++ Incorrect MA

1099_674d

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is correlated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene J is correlated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene Y is affiliated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
dewy, jerky, yucky	d	j	y	264
dewy, jerky	d	j	+	600
dewy, yucky	d	+	y	59
dewy	d	+	+	1,259
jerky, yucky	+	j	y	1,235
jerky	+	j	+	70
yucky	+	+	y	561
wildtype	+	+	+	252
TOTAL =				4,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. djy Incorrect B. dj+ Incorrect C. d+y Incorrect D. d++ Correct E. +jy Correct F. +j+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

d6c2_d69c

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene E is linked with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene H is correlated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene T is affiliated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
eery, horsey, tipsy	e	h	t	548
eery, horsey	e	h	+	919
eery, tipsy	e	+	t	2,357
eery	e	+	+	73
horsey, tipsy	+	h	t	83
horsey	+	h	+	2,401
tipsy	+	+	t	875
wildtype	+	+	+	544
TOTAL =				7,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. eht Incorrect B. eh+ Incorrect C. e+t Correct D. e++ Incorrect E. +ht Incorrect F. +h+ Correct G. ++t Incorrect H. +++ Incorrect MA

f716_2ff6

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is related to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene H is analogous to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene P is related to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
bumpy, horsey, prickly	b	h	p	483
bumpy, horsey	b	h	+	939
bumpy, prickly	b	+	p	179
bumpy	b	+	+	78
horsey, prickly	+	h	p	75
horsey	+	h	+	178
prickly	+	+	p	982
wildtype	+	+	+	486
TOTAL =				3,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bhp Incorrect B. bh+ Correct C. b+p Incorrect D. b++ Incorrect E. +hp Incorrect F. +h+ Incorrect G. ++p Correct H. +++ Incorrect MA

4161_1dd9

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is related to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene T is affiliated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene Y is linked with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
horsey, tipsy, yucky	h	t	y	420
horsey, tipsy	h	t	+	38
horsey, yucky	h	+	y	1,443
horsey	h	+	+	324
tipsy, yucky	+	t	y	285
tipsy	+	t	+	1,428
yucky	+	+	y	49
wildtype	+	+	+	363
TOTAL =				4,350

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hty Incorrect B. ht+ Incorrect C. h+y Correct D. h++ Incorrect E. +ty Incorrect F. +t+ Correct G. ++y Incorrect H. +++ Incorrect MA

2d80_b572

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is associated with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene M is linked with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene N is associated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.

Phenotype	Genotypes			Progeny Count
bumpy, mushy, nerdy	b	m	n	530
bumpy, mushy	b	m	+	52
bumpy, nerdy	b	+	n	3,175
bumpy	b	+	+	886
mushy, nerdy	+	m	n	843
mushy	+	m	+	3,104
nerdy	+	+	n	39
wildtype	+	+	+	471
TOTAL =				9,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bmn Incorrect B. bm+ Incorrect C. b+n Correct D. b++ Incorrect E. +mn Incorrect F. +m+ Correct G. ++n Incorrect H. +++ Incorrect MA

98b2_6777

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is analogous to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene C is affiliated with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene X is associated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
artsy, chummy, xanthic	a	c	x	23
artsy, chummy	a	c	+	795
artsy, xanthic	a	+	x	237
artsy	a	+	+	270
chummy, xanthic	+	c	x	250
chummy	+	c	+	231
xanthic	+	+	x	765
wildtype	+	+	+	29
TOTAL =				2,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. acx Incorrect B. ac+ Correct C. a+x Incorrect D. a++ Incorrect E. +cx Incorrect F. +c+ Incorrect G. ++x Correct H. +++ Incorrect MA

51f5_80be

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is related to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene C is linked with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene J is associated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.

Phenotype	Genotypes			Progeny Count
artsy, chummy, jerky	a	c	j	213
artsy, chummy	a	c	+	18
artsy, jerky	a	+	j	383
artsy	a	+	+	41
chummy, jerky	+	c	j	50
chummy	+	c	+	397
jerky	+	+	j	21
wildtype	+	+	+	177
TOTAL =				1,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. acj Incorrect B. ac+ Incorrect C. a+j Correct D. a++ Incorrect E. +cj Incorrect F. +c+ Correct G. ++j Incorrect H. +++ Incorrect MA

dba8_b157

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is correlated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene B is analogous to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene W is associated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
artsy, bumpy, waxy	a	b	w	1,209
artsy, bumpy	a	b	+	168
artsy, waxy	a	+	w	14
artsy	a	+	+	446
bumpy, waxy	+	b	w	405
bumpy	+	b	+	23
waxy	+	+	w	165
wildtype	+	+	+	1,270
TOTAL =				3,700

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. abw Correct B. ab+ Incorrect C. a+w Incorrect D. a++ Incorrect E. +bw Incorrect F. +b+ Incorrect G. ++w Incorrect H. +++ Correct MA

14f0_55ab

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is analogous to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene P is correlated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene W is affiliated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
horsey, prickly, waxy	h	p	w	45
horsey, prickly	h	p	+	3,258
horsey, waxy	h	+	w	858
horsey	h	+	+	359
prickly, waxy	+	p	w	353
prickly	+	p	+	833
waxy	+	+	w	3,150
wildtype	+	+	+	44
TOTAL =				8,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hpw Incorrect B. hp+ Correct C. h+w Incorrect D. h++ Incorrect E. +pw Incorrect F. +p+ Incorrect G. ++w Correct H. +++ Incorrect MA

4f1d_6436

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is analogous to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene C is linked with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene H is linked with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.

Phenotype	Genotypes			Progeny Count
bumpy, chummy, horsey	b	c	h	337
bumpy, chummy	b	c	+	411
bumpy, horsey	b	+	h	20
bumpy	b	+	+	3,468
chummy, horsey	+	c	h	3,462
chummy	+	c	+	22
horsey	+	+	h	387
wildtype	+	+	+	293
TOTAL =				8,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bch Incorrect B. bc+ Incorrect C. b+h Incorrect D. b++ Correct E. +ch Correct F. +c+ Incorrect G. ++h Incorrect H. +++ Incorrect MA

e5c8_d52d

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is related to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene P is analogous to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene R is linked with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
bumpy, prickly, rusty	b	p	r	152
bumpy, prickly	b	p	+	2,426
bumpy, rusty	b	+	r	574
bumpy	b	+	+	851
prickly, rusty	+	p	r	869
prickly	+	p	+	586
rusty	+	+	r	2,414
wildtype	+	+	+	128
TOTAL =				8,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bpr Incorrect B. bp+ Correct C. b+r Incorrect D. b++ Incorrect E. +pr Incorrect F. +p+ Incorrect G. ++r Correct H. +++ Incorrect MA

f97b_4e4a

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is affiliated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene C is analogous to the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene T is related to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
artsy, chummy, tipsy	a	c	t	762
artsy, chummy	a	c	+	2,135
artsy, tipsy	a	+	t	678
artsy	a	+	+	113
chummy, tipsy	+	c	t	146
chummy	+	c	+	617
tipsy	+	+	t	2,120
wildtype	+	+	+	829
TOTAL =				7,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. act Incorrect B. ac+ Correct C. a+t Incorrect D. a++ Incorrect E. +ct Incorrect F. +c+ Incorrect G. ++t Correct H. +++ Incorrect MA

87c2_4a9c

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is related to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene C is associated with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene K is connected with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
artsy, chummy, kidney	a	c	k	2
artsy, chummy	a	c	+	455
artsy, kidney	a	+	k	174
artsy	a	+	+	69
chummy, kidney	+	c	k	64
chummy	+	c	+	169
kidney	+	+	k	462
wildtype	+	+	+	5
TOTAL =				1,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. ack Incorrect B. ac+ Correct C. a+k Incorrect D. a++ Incorrect E. +ck Incorrect F. +c+ Incorrect G. ++k Correct H. +++ Incorrect MA

17a3_7b4f

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is associated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene K is associated with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene W is affiliated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
dewy, kidney, waxy	d	k	w	145
dewy, kidney	d	k	+	52
dewy, waxy	d	+	w	759
dewy	d	+	+	315
kidney, waxy	+	k	w	335
kidney	+	k	+	716
waxy	+	+	w	48
wildtype	+	+	+	130
TOTAL =				2,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dkw Incorrect B. dk+ Incorrect C. d+w Correct D. d++ Incorrect E. +kw Incorrect F. +k+ Correct G. ++w Incorrect H. +++ Incorrect MA

0ec4_f4d8

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is connected with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene J is associated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene Y is linked with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
horsey, jerky, yucky	h	j	y	88
horsey, jerky	h	j	+	20
horsey, yucky	h	+	y	159
horsey	h	+	+	423
jerky, yucky	+	j	y	417
jerky	+	j	+	149
yucky	+	+	y	22
wildtype	+	+	+	122
TOTAL =				1,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hjy Incorrect B. hj+ Incorrect C. h+y Incorrect D. h++ Correct E. +jy Correct F. +j+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

fcb5_9f80

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene E is analogous to the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene F is correlated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene K is related to the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
eery, fuzzy, kidney	e	f	k	728
eery, fuzzy	e	f	+	2,108
eery, kidney	e	+	k	229
eery	e	+	+	43
fuzzy, kidney	+	f	k	50
fuzzy	+	f	+	236
kidney	+	+	k	2,077
wildtype	+	+	+	729
TOTAL =				6,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. efk Incorrect B. ef+ Correct C. e+k Incorrect D. e++ Incorrect E. +fk Incorrect F. +f+ Incorrect G. ++k Correct H. +++ Incorrect MA

e6f4_ecf0

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is affiliated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene M is correlated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene W is connected with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
dewy, mushy, waxy	d	m	w	845
dewy, mushy	d	m	+	551
dewy, waxy	d	+	w	3,033
dewy	d	+	+	142
mushy, waxy	+	m	w	134
mushy	+	m	+	3,039
waxy	+	+	w	553
wildtype	+	+	+	903
TOTAL =				9,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dmw Incorrect B. dm+ Incorrect C. d+w Correct D. d++ Incorrect E. +mw Incorrect F. +m+ Correct G. ++w Incorrect H. +++ Incorrect MA

59db_5482

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene J is analogous to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene W is correlated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.
Gene X is affiliated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
jerky, waxy, xanthic	j	w	x	424
jerky, waxy	j	w	+	1,548
jerky, xanthic	j	+	x	115
jerky	j	+	+	544
waxy, xanthic	+	w	x	522
waxy	+	w	+	119
xanthic	+	+	x	1,546
wildtype	+	+	+	382
TOTAL =				5,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. jwx Incorrect B. jw+ Correct C. j+x Incorrect D. j++ Incorrect E. +wx Incorrect F. +w+ Incorrect G. ++x Correct H. +++ Incorrect MA

be57_d9f5

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is analogous to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene E is correlated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene T is linked with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
artsy, eery, tipsy	a	e	t	226
artsy, eery	a	e	+	1,926
artsy, tipsy	a	+	t	56
artsy	a	+	+	684
eery, tipsy	+	e	t	673
eery	+	e	+	62
tipsy	+	+	t	2,027
wildtype	+	+	+	246
TOTAL =				5,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. aet Incorrect B. ae+ Correct C. a+t Incorrect D. a++ Incorrect E. +et Incorrect F. +e+ Incorrect G. ++t Correct H. +++ Incorrect MA

279e_d69c

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene E is affiliated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene H is connected with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene T is related to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
eery, horsey, tipsy	e	h	t	152
eery, horsey	e	h	+	25
eery, tipsy	e	+	t	854
eery	e	+	+	1,923
horsey, tipsy	+	h	t	1,977
horsey	+	h	+	886
tipsy	+	+	t	35
wildtype	+	+	+	148
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. eht Incorrect B. eh+ Incorrect C. e+t Incorrect D. e++ Correct E. +ht Correct F. +h+ Incorrect G. ++t Incorrect H. +++ Incorrect MA

33ec_4a9c

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is associated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene C is related to the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene K is linked with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
artsy, chummy, kidney	a	c	k	1,504
artsy, chummy	a	c	+	178
artsy, kidney	a	+	k	746
artsy	a	+	+	73
chummy, kidney	+	c	k	74
chummy	+	c	+	724
kidney	+	+	k	165
wildtype	+	+	+	1,436
TOTAL =				4,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. ack Correct B. ac+ Incorrect C. a+k Incorrect D. a++ Incorrect E. +ck Incorrect F. +c+ Incorrect G. ++k Incorrect H. +++ Correct MA

0b39_101d

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is related to the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene F is analogous to the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene H is related to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.

Phenotype	Genotypes			Progeny Count
chummy, fuzzy, horsey	c	f	h	1,064
chummy, fuzzy	c	f	+	89
chummy, horsey	c	+	h	663
chummy	c	+	+	2,776
fuzzy, horsey	+	f	h	2,775
fuzzy	+	f	+	611
horsey	+	+	h	93
wildtype	+	+	+	1,029
TOTAL =				9,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. cfh Incorrect B. cf+ Incorrect C. c+h Incorrect D. c++ Correct E. +fh Correct F. +f+ Incorrect G. ++h Incorrect H. +++ Incorrect MA

9b23_2f3f

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is related to the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene N is affiliated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene W is associated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
dewy, nerdy, waxy	d	n	w	201
dewy, nerdy	d	n	+	657
dewy, waxy	d	+	w	1,517
dewy	d	+	+	47
nerdy, waxy	+	n	w	50
nerdy	+	n	+	1,490
waxy	+	+	w	701
wildtype	+	+	+	187
TOTAL =				4,850

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dnw Incorrect B. dn+ Incorrect C. d+w Correct D. d++ Incorrect E. +nw Incorrect F. +n+ Correct G. ++w Incorrect H. +++ Incorrect MA

6d76_1bec

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is analogous to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene P is related to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene T is affiliated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
horsey, prickly, tipsy	h	p	t	715
horsey, prickly	h	p	+	29
horsey, tipsy	h	+	t	96
horsey	h	+	+	1,284
prickly, tipsy	+	p	t	1,257
prickly	+	p	+	93
tipsy	+	+	t	34
wildtype	+	+	+	692
TOTAL =				4,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hpt Incorrect B. hp+ Incorrect C. h+t Incorrect D. h++ Correct E. +pt Correct F. +p+ Incorrect G. ++t Incorrect H. +++ Incorrect MA

fd48_bb0d

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is analogous to the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene F is associated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene T is associated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
dewy, fuzzy, tipsy	d	f	t	136
dewy, fuzzy	d	f	+	688
dewy, tipsy	d	+	t	161
dewy	d	+	+	15
fuzzy, tipsy	+	f	t	15
fuzzy	+	f	+	169
tipsy	+	+	t	682
wildtype	+	+	+	134
TOTAL =				2,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dft Incorrect B. df+ Correct C. d+t Incorrect D. d++ Incorrect E. +ft Incorrect F. +f+ Incorrect G. ++t Correct H. +++ Incorrect MA

45dc_cf16

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene J is correlated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene K is connected with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene X is correlated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
jerky, kidney, xanthic	j	k	x	86
jerky, kidney	j	k	+	571
jerky, xanthic	j	+	x	2,695
jerky	j	+	+	725
kidney, xanthic	+	k	x	733
kidney	+	k	+	2,651
xanthic	+	+	x	563
wildtype	+	+	+	76
TOTAL =				8,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. jkx Incorrect B. jk+ Incorrect C. j+x Correct D. j++ Incorrect E. +kx Incorrect F. +k+ Correct G. ++x Incorrect H. +++ Incorrect MA

7547_a7fa

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene E is correlated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene W is connected with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.
Gene X is analogous to the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
eery, waxy, xanthic	e	w	x	495
eery, waxy	e	w	+	2,470
eery, xanthic	e	+	x	870
eery	e	+	+	84
waxy, xanthic	+	w	x	72
waxy	+	w	+	924
xanthic	+	+	x	2,444
wildtype	+	+	+	441
TOTAL =				7,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. ewx Incorrect B. ew+ Correct C. e+x Incorrect D. e++ Incorrect E. +wx Incorrect F. +w+ Incorrect G. ++x Correct H. +++ Incorrect MA

9989_5e72

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene R is affiliated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene T is related to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
prickly, rusty, tipsy	p	r	t	350
prickly, rusty	p	r	+	538
prickly, tipsy	p	+	t	1,550
prickly	p	+	+	49
rusty, tipsy	+	r	t	53
rusty	+	r	+	1,561
tipsy	+	+	t	635
wildtype	+	+	+	364
TOTAL =				5,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. prt Incorrect B. pr+ Incorrect C. p+t Correct D. p++ Incorrect E. +rt Incorrect F. +r+ Correct G. ++t Incorrect H. +++ Incorrect MA

7e7b_ad6f

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is associated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene J is connected with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene X is connected with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
dewy, jerky, xanthic	d	j	x	240
dewy, jerky	d	j	+	189
dewy, xanthic	d	+	x	47
dewy	d	+	+	731
jerky, xanthic	+	j	x	673
jerky	+	j	+	61
xanthic	+	+	x	207
wildtype	+	+	+	252
TOTAL =				2,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. djx Incorrect B. dj+ Incorrect C. d+x Incorrect D. d++ Correct E. +jx Correct F. +j+ Incorrect G. ++x Incorrect H. +++ Incorrect MA

9687_9471

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene N is related to the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene P is analogous to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene W is associated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
nerdy, prickly, waxy	n	p	w	477
nerdy, prickly	n	p	+	41
nerdy, waxy	n	+	w	193
nerdy	n	+	+	983
prickly, waxy	+	p	w	1,023
prickly	+	p	+	181
waxy	+	+	w	61
wildtype	+	+	+	441
TOTAL =				3,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. npw Incorrect B. np+ Incorrect C. n+w Incorrect D. n++ Correct E. +pw Correct F. +p+ Incorrect G. ++w Incorrect H. +++ Incorrect MA

bc08_75f9

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is linked with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene F is connected with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene J is associated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.

Phenotype	Genotypes			Progeny Count
dewy, fuzzy, jerky	d	f	j	35
dewy, fuzzy	d	f	+	1,137
dewy, jerky	d	+	j	185
dewy	d	+	+	519
fuzzy, jerky	+	f	j	531
fuzzy	+	f	+	190
jerky	+	+	j	1,113
wildtype	+	+	+	40
TOTAL =				3,750

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dfj Incorrect B. df+ Correct C. d+j Incorrect D. d++ Incorrect E. +fj Incorrect F. +f+ Incorrect G. ++j Correct H. +++ Incorrect MA

7372_51cf

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene K is related to the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene M is affiliated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene T is analogous to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
kidney, mushy, tipsy	k	m	t	568
kidney, mushy	k	m	+	104
kidney, tipsy	k	+	t	459
kidney	k	+	+	1,551
mushy, tipsy	+	m	t	1,608
mushy	+	m	+	432
tipsy	+	+	t	85
wildtype	+	+	+	593
TOTAL =				5,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. kmt Incorrect B. km+ Incorrect C. k+t Incorrect D. k++ Correct E. +mt Correct F. +m+ Incorrect G. ++t Incorrect H. +++ Incorrect MA

5bb7_273e

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is analogous to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene R is correlated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene W is correlated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
horsey, rusty, waxy	h	r	w	246
horsey, rusty	h	r	+	1,177
horsey, waxy	h	+	w	47
horsey	h	+	+	3,260
rusty, waxy	+	r	w	3,180
rusty	+	r	+	45
waxy	+	+	w	1,031
wildtype	+	+	+	214
TOTAL =				9,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hrw Incorrect B. hr+ Incorrect C. h+w Incorrect D. h++ Correct E. +rw Correct F. +r+ Incorrect G. ++w Incorrect H. +++ Incorrect MA

0562_9471

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene N is linked with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene W is related to the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
nerdy, prickly, waxy	n	p	w	62
nerdy, prickly	n	p	+	1,796
nerdy, waxy	n	+	w	936
nerdy	n	+	+	174
prickly, waxy	+	p	w	186
prickly	+	p	+	1,044
waxy	+	+	w	1,744
wildtype	+	+	+	58
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. npw Incorrect B. np+ Correct C. n+w Incorrect D. n++ Incorrect E. +pw Incorrect F. +p+ Incorrect G. ++w Correct H. +++ Incorrect MA

4ce2_0380

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is related to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene M is correlated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene T is connected with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
artsy, mushy, tipsy	a	m	t	487
artsy, mushy	a	m	+	2,352
artsy, tipsy	a	+	t	123
artsy	a	+	+	1,114
mushy, tipsy	+	m	t	1,073
mushy	+	m	+	120
tipsy	+	+	t	2,346
wildtype	+	+	+	485
TOTAL =				8,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. amt Incorrect B. am+ Correct C. a+t Incorrect D. a++ Incorrect E. +mt Incorrect F. +m+ Incorrect G. ++t Correct H. +++ Incorrect MA

01f3_4807

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is connected with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene K is connected with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene R is affiliated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
chummy, kidney, rusty	c	k	r	2,396
chummy, kidney	c	k	+	921
chummy, rusty	c	+	r	65
chummy	c	+	+	540
kidney, rusty	+	k	r	513
kidney	+	k	+	52
rusty	+	+	r	912
wildtype	+	+	+	2,401
TOTAL =				7,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. ckr Correct B. ck+ Incorrect C. c+r Incorrect D. c++ Incorrect E. +kr Incorrect F. +k+ Incorrect G. ++r Incorrect H. +++ Correct MA

c415_e8da

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is correlated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene K is associated with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene W is related to the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
horsey, kidney, waxy	h	k	w	1,843
horsey, kidney	h	k	+	22
horsey, waxy	h	+	w	152
horsey	h	+	+	316
kidney, waxy	+	k	w	314
kidney	+	k	+	163
waxy	+	+	w	23
wildtype	+	+	+	1,667
TOTAL =				4,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hkw Correct B. hk+ Incorrect C. h+w Incorrect D. h++ Incorrect E. +kw Incorrect F. +k+ Incorrect G. ++w Incorrect H. +++ Correct MA

d1e4_2de3

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is associated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene K is associated with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene P is related to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
dewy, kidney, prickly	d	k	p	480
dewy, kidney	d	k	+	360
dewy, prickly	d	+	p	2,645
dewy	d	+	+	61
kidney, prickly	+	k	p	44
kidney	+	k	+	2,570
prickly	+	+	p	375
wildtype	+	+	+	465
TOTAL =				7,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dkp Incorrect B. dk+ Incorrect C. d+p Correct D. d++ Incorrect E. +kp Incorrect F. +k+ Correct G. ++p Incorrect H. +++ Incorrect MA

b021_6178

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is analogous to the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene N is connected with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene T is affiliated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
dewy, nerdy, tipsy	d	n	t	1,259
dewy, nerdy	d	n	+	22
dewy, tipsy	d	+	t	136
dewy	d	+	+	2,831
nerdy, tipsy	+	n	t	2,888
nerdy	+	n	+	165
tipsy	+	+	t	21
wildtype	+	+	+	1,278
TOTAL =				8,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dnt Incorrect B. dn+ Incorrect C. d+t Incorrect D. d++ Correct E. +nt Correct F. +n+ Incorrect G. ++t Incorrect H. +++ Incorrect MA

7acb_d8a4

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is correlated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene N is connected with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene P is correlated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
artsy, nerdy, prickly	a	n	p	337
artsy, nerdy	a	n	+	255
artsy, prickly	a	+	p	58
artsy	a	+	+	923
nerdy, prickly	+	n	p	949
nerdy	+	n	+	54
prickly	+	+	p	273
wildtype	+	+	+	351
TOTAL =				3,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. anp Incorrect B. an+ Incorrect C. a+p Incorrect D. a++ Correct E. +np Correct F. +n+ Incorrect G. ++p Incorrect H. +++ Incorrect MA

13a7_ec39

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is associated with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene K is linked with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene P is analogous to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
bumpy, kidney, prickly	b	k	p	1,146
bumpy, kidney	b	k	+	484
bumpy, prickly	b	+	p	37
bumpy	b	+	+	111
kidney, prickly	+	k	p	102
kidney	+	k	+	34
prickly	+	+	p	510
wildtype	+	+	+	1,126
TOTAL =				3,550

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bkp Correct B. bk+ Incorrect C. b+p Incorrect D. b++ Incorrect E. +kp Incorrect F. +k+ Incorrect G. ++p Incorrect H. +++ Correct MA

3194_4bbc

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene N is correlated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene R is associated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene Y is related to the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
nerdy, rusty, yucky	n	r	y	1,817
nerdy, rusty	n	r	+	380
nerdy, yucky	n	+	y	506
nerdy	n	+	+	37
rusty, yucky	+	r	y	47
rusty	+	r	+	530
yucky	+	+	y	376
wildtype	+	+	+	1,907
TOTAL =				5,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. nry Correct B. nr+ Incorrect C. n+y Incorrect D. n++ Incorrect E. +ry Incorrect F. +r+ Incorrect G. ++y Incorrect H. +++ Correct MA

6dd8_6b22

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is associated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene J is connected with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene W is linked with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
artsy, jerky, waxy	a	j	w	400
artsy, jerky	a	j	+	48
artsy, waxy	a	+	w	677
artsy	a	+	+	3,442
jerky, waxy	+	j	w	3,533
jerky	+	j	+	718
waxy	+	+	w	45
wildtype	+	+	+	437
TOTAL =				9,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. ajw Incorrect B. aj+ Incorrect C. a+w Incorrect D. a++ Correct E. +jw Correct F. +j+ Incorrect G. ++w Incorrect H. +++ Incorrect MA

07e6_b5c0

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is connected with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene R is associated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
artsy, prickly, rusty	a	p	r	2,287
artsy, prickly	a	p	+	326
artsy, rusty	a	+	r	71
artsy	a	+	+	596
prickly, rusty	+	p	r	592
prickly	+	p	+	61
rusty	+	+	r	334
wildtype	+	+	+	2,333
TOTAL =				6,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. apr Correct B. ap+ Incorrect C. a+r Incorrect D. a++ Incorrect E. +pr Incorrect F. +p+ Incorrect G. ++r Incorrect H. +++ Correct MA

6255_69f8

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is associated with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene P is linked with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene T is related to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
chummy, prickly, tipsy	c	p	t	48
chummy, prickly	c	p	+	1,823
chummy, tipsy	c	+	t	1,053
chummy	c	+	+	107
prickly, tipsy	+	p	t	103
prickly	+	p	+	1,017
tipsy	+	+	t	1,807
wildtype	+	+	+	42
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. cpt Incorrect B. cp+ Correct C. c+t Incorrect D. c++ Incorrect E. +pt Incorrect F. +p+ Incorrect G. ++t Correct H. +++ Incorrect MA

3d6b_f421

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is associated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene D is affiliated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene R is related to the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
artsy, dewy, rusty	a	d	r	1,839
artsy, dewy	a	d	+	177
artsy, rusty	a	+	r	10
artsy	a	+	+	231
dewy, rusty	+	d	r	187
dewy	+	d	+	12
rusty	+	+	r	153
wildtype	+	+	+	1,791
TOTAL =				4,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. adr Correct B. ad+ Incorrect C. a+r Incorrect D. a++ Incorrect E. +dr Incorrect F. +d+ Incorrect G. ++r Incorrect H. +++ Correct MA

5f42_2819

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is linked with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene D is connected with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene T is linked with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
chummy, dewy, tipsy	c	d	t	4
chummy, dewy	c	d	+	341
chummy, tipsy	c	+	t	662
chummy	c	+	+	91
dewy, tipsy	+	d	t	118
dewy	+	d	+	669
tipsy	+	+	t	308
wildtype	+	+	+	7
TOTAL =				2,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. cdt Incorrect B. cd+ Incorrect C. c+t Correct D. c++ Incorrect E. +dt Incorrect F. +d+ Correct G. ++t Incorrect H. +++ Incorrect MA

0a5b_c2d4

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is correlated with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene F is affiliated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene M is related to the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.

Phenotype	Genotypes			Progeny Count
chummy, fuzzy, mushy	c	f	m	2,389
chummy, fuzzy	c	f	+	254
chummy, mushy	c	+	m	45
chummy	c	+	+	1,113
fuzzy, mushy	+	f	m	1,091
fuzzy	+	f	+	31
mushy	+	+	m	278
wildtype	+	+	+	2,399
TOTAL =				7,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. cfm Correct B. cf+ Incorrect C. c+m Incorrect D. c++ Incorrect E. +fm Incorrect F. +f+ Incorrect G. ++m Incorrect H. +++ Correct MA

0437_974d

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene J is related to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene T is associated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene X is related to the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
jerky, tipsy, xanthic	j	t	x	183
jerky, tipsy	j	t	+	972
jerky, xanthic	j	+	x	2,986
jerky	j	+	+	36
tipsy, xanthic	+	t	x	48
tipsy	+	t	+	2,978
xanthic	+	+	x	1,044
wildtype	+	+	+	153
TOTAL =				8,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. jtx Incorrect B. jt+ Incorrect C. j+x Correct D. j++ Incorrect E. +tx Incorrect F. +t+ Correct G. ++x Incorrect H. +++ Incorrect MA

5714_1dd9

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is correlated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene T is linked with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene Y is related to the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
horsey, tipsy, yucky	h	t	y	599
horsey, tipsy	h	t	+	144
horsey, yucky	h	+	y	916
horsey	h	+	+	3,212
tipsy, yucky	+	t	y	3,190
tipsy	+	t	+	927
yucky	+	+	y	147
wildtype	+	+	+	565
TOTAL =				9,700

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hty Incorrect B. ht+ Incorrect C. h+y Incorrect D. h++ Correct E. +ty Correct F. +t+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

ce1c_a409

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene E is analogous to the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene J is analogous to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene T is related to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
eery, jerky, tipsy	e	j	t	245
eery, jerky	e	j	+	28
eery, tipsy	e	+	t	584
eery	e	+	+	2,204
jerky, tipsy	+	j	t	2,188
jerky	+	j	+	575
tipsy	+	+	t	33
wildtype	+	+	+	243
TOTAL =				6,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. ejt Incorrect B. ej+ Incorrect C. e+t Incorrect D. e++ Correct E. +jt Correct F. +j+ Incorrect G. ++t Incorrect H. +++ Incorrect MA

18bb_96a1

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene F is related to the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene K is associated with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene Y is associated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
fuzzy, kidney, yucky	f	k	y	283
fuzzy, kidney	f	k	+	79
fuzzy, yucky	f	+	y	321
fuzzy	f	+	+	914
kidney, yucky	+	k	y	926
kidney	+	k	+	335
yucky	+	+	y	65
wildtype	+	+	+	277
TOTAL =				3,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. fky Incorrect B. fk+ Incorrect C. f+y Incorrect D. f++ Correct E. +ky Correct F. +k+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

5d89_9f4c

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene F is affiliated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene H is linked with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene X is connected with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
fuzzy, horsey, xanthic	f	h	x	327
fuzzy, horsey	f	h	+	1,723
fuzzy, xanthic	f	+	x	8
fuzzy	f	+	+	71
horsey, xanthic	+	h	x	76
horsey	+	h	+	13
xanthic	+	+	x	1,700
wildtype	+	+	+	282
TOTAL =				4,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. fhx Incorrect B. fh+ Correct C. f+x Incorrect D. f++ Incorrect E. +hx Incorrect F. +h+ Incorrect G. ++x Correct H. +++ Incorrect MA

4653_cefa

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene F is connected with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene T is connected with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene Y is correlated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
fuzzy, tipsy, yucky	f	t	y	1,014
fuzzy, tipsy	f	t	+	10
fuzzy, yucky	f	+	y	240
fuzzy	f	+	+	399
tipsy, yucky	+	t	y	434
tipsy	+	t	+	219
yucky	+	+	y	7
wildtype	+	+	+	1,077
TOTAL =				3,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. fty Correct B. ft+ Incorrect C. f+y Incorrect D. f++ Incorrect E. +ty Incorrect F. +t+ Incorrect G. ++y Incorrect H. +++ Correct MA

650a_1311

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is related to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene J is affiliated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene K is linked with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
horsey, jerky, kidney	h	j	k	146
horsey, jerky	h	j	+	1,555
horsey, kidney	h	+	k	849
horsey	h	+	+	54
jerky, kidney	+	j	k	50
jerky	+	j	+	867
kidney	+	+	k	1,513
wildtype	+	+	+	166
TOTAL =				5,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hjk Incorrect B. hj+ Correct C. h+k Incorrect D. h++ Incorrect E. +jk Incorrect F. +j+ Incorrect G. ++k Correct H. +++ Incorrect MA

64a0_b880

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is affiliated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene H is connected with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene W is linked with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
dewy, horsey, waxy	d	h	w	73
dewy, horsey	d	h	+	218
dewy, waxy	d	+	w	560
dewy	d	+	+	1,259
horsey, waxy	+	h	w	1,240
horsey	+	h	+	553
waxy	+	+	w	223
wildtype	+	+	+	74
TOTAL =				4,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dhw Incorrect B. dh+ Incorrect C. d+w Incorrect D. d++ Correct E. +hw Correct F. +h+ Incorrect G. ++w Incorrect H. +++ Incorrect MA

11b6_639e

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is associated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene B is analogous to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene R is connected with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
artsy, bumpy, rusty	a	b	r	2,439
artsy, bumpy	a	b	+	1,057
artsy, rusty	a	+	r	462
artsy	a	+	+	163
bumpy, rusty	+	b	r	169
bumpy	+	b	+	451
rusty	+	+	r	1,101
wildtype	+	+	+	2,458
TOTAL =				8,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. abr Correct B. ab+ Incorrect C. a+r Incorrect D. a++ Incorrect E. +br Incorrect F. +b+ Incorrect G. ++r Incorrect H. +++ Correct MA

2d4d_8197

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is associated with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene D is linked with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene E is affiliated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.

Phenotype	Genotypes			Progeny Count
chummy, dewy, eery	c	d	e	26
chummy, dewy	c	d	+	276
chummy, eery	c	+	e	194
chummy	c	+	+	1,647
dewy, eery	+	d	e	1,664
dewy	+	d	+	193
eery	+	+	e	283
wildtype	+	+	+	17
TOTAL =				4,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. cde Incorrect B. cd+ Incorrect C. c+e Incorrect D. c++ Correct E. +de Correct F. +d+ Incorrect G. ++e Incorrect H. +++ Incorrect MA

35ad_59c4

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene M is related to the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene P is associated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene Y is analogous to the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
mushy, prickly, yucky	m	p	y	213
mushy, prickly	m	p	+	817
mushy, yucky	m	+	y	21
mushy	m	+	+	3,604
prickly, yucky	+	p	y	3,681
prickly	+	p	+	26
yucky	+	+	y	828
wildtype	+	+	+	210
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. mpy Incorrect B. mp+ Incorrect C. m+y Incorrect D. m++ Correct E. +py Correct F. +p+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

e52a_43bd

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is related to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene N is associated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene Y is linked with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
bumpy, nerdy, yucky	b	n	y	14
bumpy, nerdy	b	n	+	124
bumpy, yucky	b	+	y	304
bumpy	b	+	+	64
nerdy, yucky	+	n	y	66
nerdy	+	n	+	326
yucky	+	+	y	96
wildtype	+	+	+	6
TOTAL =				1,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bny Incorrect B. bn+ Incorrect C. b+y Correct D. b++ Incorrect E. +ny Incorrect F. +n+ Correct G. ++y Incorrect H. +++ Incorrect MA

2a9f_18dc

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is associated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene J is connected with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene R is linked with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
dewy, jerky, rusty	d	j	r	118
dewy, jerky	d	j	+	183
dewy, rusty	d	+	r	658
dewy	d	+	+	21
jerky, rusty	+	j	r	19
jerky	+	j	+	682
rusty	+	+	r	177
wildtype	+	+	+	142
TOTAL =				2,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. djr Incorrect B. dj+ Incorrect C. d+r Correct D. d++ Incorrect E. +jr Incorrect F. +j+ Correct G. ++r Incorrect H. +++ Incorrect MA

5966_a78b

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene J is connected with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene M is connected with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene N is analogous to the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.

Phenotype	Genotypes			Progeny Count
jerky, mushy, nerdy	j	m	n	889
jerky, mushy	j	m	+	45
jerky, nerdy	j	+	n	324
jerky	j	+	+	152
mushy, nerdy	+	m	n	196
mushy	+	m	+	314
nerdy	+	+	n	42
wildtype	+	+	+	938
TOTAL =				2,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. jmn Correct B. jm+ Incorrect C. j+n Incorrect D. j++ Incorrect E. +mn Incorrect F. +m+ Incorrect G. ++n Incorrect H. +++ Correct MA

e18f_5d6f

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene J is linked with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene T is associated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene Y is correlated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
jerky, tipsy, yucky	j	t	y	658
jerky, tipsy	j	t	+	1,839
jerky, yucky	j	+	y	152
jerky	j	+	+	16
tipsy, yucky	+	t	y	11
tipsy	+	t	+	145
yucky	+	+	y	1,914
wildtype	+	+	+	665
TOTAL =				5,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. jty Incorrect B. jt+ Correct C. j+y Incorrect D. j++ Incorrect E. +ty Incorrect F. +t+ Incorrect G. ++y Correct H. +++ Incorrect MA

601b_ca51

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is linked with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene Y is associated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
artsy, prickly, yucky	a	p	y	230
artsy, prickly	a	p	+	298
artsy, yucky	a	+	y	897
artsy	a	+	+	48
prickly, yucky	+	p	y	39
prickly	+	p	+	843
yucky	+	+	y	340
wildtype	+	+	+	205
TOTAL =				2,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. apy Incorrect B. ap+ Incorrect C. a+y Correct D. a++ Incorrect E. +py Incorrect F. +p+ Correct G. ++y Incorrect H. +++ Incorrect MA

45d3_d62d

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is linked with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene B is correlated with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene X is correlated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
artsy, bumpy, xanthic	a	b	x	565
artsy, bumpy	a	b	+	19
artsy, xanthic	a	+	x	125
artsy	a	+	+	2,262
bumpy, xanthic	+	b	x	2,268
bumpy	+	b	+	145
xanthic	+	+	x	11
wildtype	+	+	+	605
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. abx Incorrect B. ab+ Incorrect C. a+x Incorrect D. a++ Correct E. +bx Correct F. +b+ Incorrect G. ++x Incorrect H. +++ Incorrect MA

4549_d24a

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene E is correlated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene H is connected with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene K is affiliated with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
eery, horsey, kidney	e	h	k	20
eery, horsey	e	h	+	6
eery, kidney	e	+	k	303
eery	e	+	+	181
horsey, kidney	+	h	k	164
horsey	+	h	+	302
kidney	+	+	k	9
wildtype	+	+	+	15
TOTAL =				1,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. ehk Incorrect B. eh+ Incorrect C. e+k Correct D. e++ Incorrect E. +hk Incorrect F. +h+ Correct G. ++k Incorrect H. +++ Incorrect MA

e219_cb06

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene C is linked with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene D is correlated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene Y is correlated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
chummy, dewy, yucky	c	d	y	1,075
chummy, dewy	c	d	+	15
chummy, yucky	c	+	y	417
chummy	c	+	+	273
dewy, yucky	+	d	y	267
dewy	+	d	+	447
yucky	+	+	y	21
wildtype	+	+	+	1,085
TOTAL =				3,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. cdy Correct B. cd+ Incorrect C. c+y Incorrect D. c++ Incorrect E. +dy Incorrect F. +d+ Incorrect G. ++y Incorrect H. +++ Correct MA

f157_d402

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is analogous to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene H is associated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene Y is linked with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
bumpy, horsey, yucky	b	h	y	284
bumpy, horsey	b	h	+	71
bumpy, yucky	b	+	y	1,063
bumpy	b	+	+	310
horsey, yucky	+	h	y	311
horsey	+	h	+	1,076
yucky	+	+	y	67
wildtype	+	+	+	268
TOTAL =				3,450

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bhy Incorrect B. bh+ Incorrect C. b+y Correct D. b++ Incorrect E. +hy Incorrect F. +h+ Correct G. ++y Incorrect H. +++ Incorrect MA

b837_a983

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is associated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene C is analogous to the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene F is associated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.

Phenotype	Genotypes			Progeny Count
artsy, chummy, fuzzy	a	c	f	182
artsy, chummy	a	c	+	12
artsy, fuzzy	a	+	f	525
artsy	a	+	+	59
chummy, fuzzy	+	c	f	53
chummy	+	c	+	563
fuzzy	+	+	f	4
wildtype	+	+	+	202
TOTAL =				1,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. acf Incorrect B. ac+ Incorrect C. a+f Correct D. a++ Incorrect E. +cf Incorrect F. +c+ Correct G. ++f Incorrect H. +++ Incorrect MA

871f_41a8

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene D is linked with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene M is correlated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene Y is linked with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
dewy, mushy, yucky	d	m	y	932
dewy, mushy	d	m	+	27
dewy, yucky	d	+	y	174
dewy	d	+	+	361
mushy, yucky	+	m	y	329
mushy	+	m	+	186
yucky	+	+	y	33
wildtype	+	+	+	958
TOTAL =				3,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. dmy Correct B. dm+ Incorrect C. d+y Incorrect D. d++ Incorrect E. +my Incorrect F. +m+ Incorrect G. ++y Incorrect H. +++ Correct MA

eb7d_da36

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene N is associated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene P is linked with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene T is linked with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
nerdy, prickly, tipsy	n	p	t	313
nerdy, prickly	n	p	+	1,642
nerdy, tipsy	n	+	t	12
nerdy	n	+	+	163
prickly, tipsy	+	p	t	152
prickly	+	p	+	9
tipsy	+	+	t	1,613
wildtype	+	+	+	296
TOTAL =				4,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. npt Incorrect B. np+ Correct C. n+t Incorrect D. n++ Incorrect E. +pt Incorrect F. +p+ Incorrect G. ++t Correct H. +++ Incorrect MA

8e45_2696

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is related to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene W is affiliated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.
Gene X is associated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
artsy, waxy, xanthic	a	w	x	1,316
artsy, waxy	a	w	+	593
artsy, xanthic	a	+	x	68
artsy	a	+	+	190
waxy, xanthic	+	w	x	162
waxy	+	w	+	64
xanthic	+	+	x	595
wildtype	+	+	+	1,412
TOTAL =				4,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. awx Correct B. aw+ Incorrect C. a+x Incorrect D. a++ Incorrect E. +wx Incorrect F. +w+ Incorrect G. ++x Incorrect H. +++ Correct MA

f417_0f2c

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is related to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene J is connected with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
horsey, jerky, prickly	h	j	p	9
horsey, jerky	h	j	+	29
horsey, prickly	h	+	p	1,122
horsey	h	+	+	290
jerky, prickly	+	j	p	295
jerky	+	j	+	1,203
prickly	+	+	p	46
wildtype	+	+	+	6
TOTAL =				3,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hjp Incorrect B. hj+ Incorrect C. h+p Correct D. h++ Incorrect E. +jp Incorrect F. +j+ Correct G. ++p Incorrect H. +++ Incorrect MA

f735_623c

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is analogous to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene F is affiliated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene P is affiliated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
bumpy, fuzzy, prickly	b	f	p	2,953
bumpy, fuzzy	b	f	+	194
bumpy, prickly	b	+	p	17
bumpy	b	+	+	341
fuzzy, prickly	+	f	p	324
fuzzy	+	f	+	18
prickly	+	+	p	191
wildtype	+	+	+	2,962
TOTAL =				7,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bfp Correct B. bf+ Incorrect C. b+p Incorrect D. b++ Incorrect E. +fp Incorrect F. +f+ Incorrect G. ++p Incorrect H. +++ Correct MA

b0f5_53da

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene M is correlated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene N is connected with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene T is correlated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
mushy, nerdy, tipsy	m	n	t	169
mushy, nerdy	m	n	+	613
mushy, tipsy	m	+	t	7
mushy	m	+	+	32
nerdy, tipsy	+	n	t	36
nerdy	+	n	+	10
tipsy	+	+	t	645
wildtype	+	+	+	188
TOTAL =				1,700

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. mnt Incorrect B. mn+ Correct C. m+t Incorrect D. m++ Incorrect E. +nt Incorrect F. +n+ Incorrect G. ++t Correct H. +++ Incorrect MA

b41c_b4ef

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is associated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene H is linked with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene Y is analogous to the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
artsy, horsey, yucky	a	h	y	894
artsy, horsey	a	h	+	2,822
artsy, yucky	a	+	y	202
artsy	a	+	+	62
horsey, yucky	+	h	y	58
horsey	+	h	+	238
yucky	+	+	y	2,738
wildtype	+	+	+	986
TOTAL =				8,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. ahy Incorrect B. ah+ Correct C. a+y Incorrect D. a++ Incorrect E. +hy Incorrect F. +h+ Incorrect G. ++y Correct H. +++ Incorrect MA

1cd3_c11e

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene A is affiliated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene E is analogous to the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene P is related to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
artsy, eery, prickly	a	e	p	846
artsy, eery	a	e	+	373
artsy, prickly	a	+	p	103
artsy	a	+	+	1,848
eery, prickly	+	e	p	1,806
eery	+	e	+	86
prickly	+	+	p	383
wildtype	+	+	+	855
TOTAL =				6,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. aep Incorrect B. ae+ Incorrect C. a+p Incorrect D. a++ Correct E. +ep Correct F. +e+ Incorrect G. ++p Incorrect H. +++ Incorrect MA

0cb0_bcaa

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene H is affiliated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene N is associated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene W is correlated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
horsey, nerdy, waxy	h	n	w	198
horsey, nerdy	h	n	+	708
horsey, waxy	h	+	w	3,613
horsey	h	+	+	22
nerdy, waxy	+	n	w	24
nerdy	+	n	+	3,701
waxy	+	+	w	718
wildtype	+	+	+	216
TOTAL =				9,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. hnw Incorrect B. hn+ Incorrect C. h+w Correct D. h++ Incorrect E. +nw Incorrect F. +n+ Correct G. ++w Incorrect H. +++ Incorrect MA

4bcb_e053

Three-Point Test Cross Problem

A standard three-point test cross involves crossing a heterozygous organism for all three genes with an organism that is homozygous recessive for all three genes

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for three genes was conducted to understand their genetic interactions.

Characteristics of Recessive Phenotypes

Gene B is correlated with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene C is linked with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene J is associated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.

Phenotype	Genotypes			Progeny Count
bumpy, chummy, jerky	b	c	j	1,101
bumpy, chummy	b	c	+	3,330
bumpy, jerky	b	+	j	196
bumpy	b	+	+	42
chummy, jerky	+	c	j	51
chummy	+	c	+	176
jerky	+	+	j	3,366
wildtype	+	+	+	1,038
TOTAL =				9,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the parental genotype combinations. These are the allele combinations that the parent fruit flies originally carried.

More than one genotype will be correct. Select all that apply.

A. bcj Incorrect B. bc+ Correct C. b+j Incorrect D. b++ Incorrect E. +cj Incorrect F. +c+ Incorrect G. ++j Correct H. +++ Incorrect