485c_3c2c

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 B is linked 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 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 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
bumpy, nerdy, rusty	b	n	r	733
bumpy, nerdy	b	n	+	195
bumpy, rusty	b	+	r	842
bumpy	b	+	+	2,474
nerdy, rusty	+	n	r	2,557
nerdy	+	n	+	921
rusty	+	+	r	192
wildtype	+	+	+	686
TOTAL =				8,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bnr Incorrect B. bn+ Correct C. b+r Incorrect D. b++ Incorrect E. +nr Incorrect F. +n+ Incorrect G. ++r Correct H. +++ Incorrect MA

f7fd_8267

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 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 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 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
dewy, nerdy, yucky	d	n	y	941
dewy, nerdy	d	n	+	882
dewy, yucky	d	+	y	2,878
dewy	d	+	+	108
nerdy, yucky	+	n	y	88
nerdy	+	n	+	3,002
yucky	+	+	y	882
wildtype	+	+	+	1,019
TOTAL =				9,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. dny Incorrect B. dn+ Incorrect C. d+y Incorrect D. d++ Correct E. +ny Correct F. +n+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

f108_2596

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 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 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
bumpy, eery, rusty	b	e	r	58
bumpy, eery	b	e	+	130
bumpy, rusty	b	+	r	497
bumpy	b	+	+	6
eery, rusty	+	e	r	8
eery	+	e	+	497
rusty	+	+	r	136
wildtype	+	+	+	68
TOTAL =				1,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ber Incorrect B. be+ Incorrect C. b+r Incorrect D. b++ Correct E. +er Correct F. +e+ Incorrect G. ++r Incorrect H. +++ Incorrect MA

3455_f0c8

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 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 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
artsy, eery, xanthic	a	e	x	3
artsy, eery	a	e	+	86
artsy, xanthic	a	+	x	298
artsy	a	+	+	636
eery, xanthic	+	e	x	574
eery	+	e	+	292
xanthic	+	+	x	104
wildtype	+	+	+	7
TOTAL =				2,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. aex Correct B. ae+ Incorrect C. a+x Incorrect D. a++ Incorrect E. +ex Incorrect F. +e+ Incorrect G. ++x Incorrect H. +++ Correct MA

f3b9_f40c

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 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.
Gene X is related to the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.
Gene Y is connected 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
waxy, xanthic, yucky	w	x	y	870
waxy, xanthic	w	x	+	156
waxy, yucky	w	+	y	2,517
waxy	w	+	+	16
xanthic, yucky	+	x	y	20
xanthic	+	x	+	2,559
yucky	+	+	y	168
wildtype	+	+	+	894
TOTAL =				7,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. wxy Incorrect B. wx+ Incorrect C. w+y Incorrect D. w++ Correct E. +xy Correct F. +x+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

e9e6_4cee

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 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.

Phenotype	Genotypes			Progeny Count
chummy, jerky, xanthic	c	j	x	308
chummy, jerky	c	j	+	144
chummy, xanthic	c	+	x	23
chummy	c	+	+	65
jerky, xanthic	+	j	x	56
jerky	+	j	+	21
xanthic	+	+	x	142
wildtype	+	+	+	341
TOTAL =				1,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cjx Incorrect B. cj+ Incorrect C. c+x Correct D. c++ Incorrect E. +jx Incorrect F. +j+ Correct G. ++x Incorrect H. +++ Incorrect MA

88b8_63a2

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 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 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 W is analogous 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
fuzzy, tipsy, waxy	f	t	w	72
fuzzy, tipsy	f	t	+	1,254
fuzzy, waxy	f	+	w	707
fuzzy	f	+	+	155
tipsy, waxy	+	t	w	146
tipsy	+	t	+	669
waxy	+	+	w	1,240
wildtype	+	+	+	57
TOTAL =				4,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ftw Correct B. ft+ Incorrect C. f+w Incorrect D. f++ Incorrect E. +tw Incorrect F. +t+ Incorrect G. ++w Incorrect H. +++ Correct MA

efb1_901a

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 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 M is associated 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.

Phenotype	Genotypes			Progeny Count
bumpy, dewy, mushy	b	d	m	388
bumpy, dewy	b	d	+	127
bumpy, mushy	b	+	m	909
bumpy	b	+	+	1,986
dewy, mushy	+	d	m	1,958
dewy	+	d	+	859
mushy	+	+	m	145
wildtype	+	+	+	428
TOTAL =				6,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bdm Incorrect B. bd+ Correct C. b+m Incorrect D. b++ Incorrect E. +dm Incorrect F. +d+ Incorrect G. ++m Correct H. +++ Incorrect MA

82cb_4582

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 K is correlated 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
horsey, kidney, yucky	h	k	y	1,272
horsey, kidney	h	k	+	243
horsey, yucky	h	+	y	12
horsey	h	+	+	150
kidney, yucky	+	k	y	147
kidney	+	k	+	21
yucky	+	+	y	252
wildtype	+	+	+	1,203
TOTAL =				3,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. hky Incorrect B. hk+ Incorrect C. h+y Correct D. h++ Incorrect E. +ky Incorrect F. +k+ Correct G. ++y Incorrect H. +++ Incorrect MA

44bc_a9ab

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 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 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 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
rusty, waxy, yucky	r	w	y	408
rusty, waxy	r	w	+	57
rusty, yucky	r	+	y	192
rusty	r	+	+	952
waxy, yucky	+	w	y	968
waxy	+	w	+	192
yucky	+	+	y	39
wildtype	+	+	+	392
TOTAL =				3,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. rwy Incorrect B. rw+ Correct C. r+y Incorrect D. r++ Incorrect E. +wy Incorrect F. +w+ Incorrect G. ++y Correct H. +++ Incorrect MA

6953_e78f

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 analogous 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 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 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
kidney, prickly, rusty	k	p	r	42
kidney, prickly	k	p	+	239
kidney, rusty	k	+	r	585
kidney	k	+	+	1,655
prickly, rusty	+	p	r	1,620
prickly	+	p	+	590
rusty	+	+	r	236
wildtype	+	+	+	33
TOTAL =				5,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. kpr Correct B. kp+ Incorrect C. k+r Incorrect D. k++ Incorrect E. +pr Incorrect F. +p+ Incorrect G. ++r Incorrect H. +++ Correct MA

39f8_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 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 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 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
dewy, prickly, rusty	d	p	r	90
dewy, prickly	d	p	+	191
dewy, rusty	d	+	r	19
dewy	d	+	+	499
prickly, rusty	+	p	r	517
prickly	+	p	+	21
rusty	+	+	r	169
wildtype	+	+	+	94
TOTAL =				1,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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

8f19_81a8

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 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 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 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
chummy, eery, prickly	c	e	p	101
chummy, eery	c	e	+	770
chummy, prickly	c	+	p	301
chummy	c	+	+	1,603
eery, prickly	+	e	p	1,589
eery	+	e	+	315
prickly	+	+	p	798
wildtype	+	+	+	123
TOTAL =				5,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cep Correct B. ce+ Incorrect C. c+p Incorrect D. c++ Incorrect E. +ep Incorrect F. +e+ Incorrect G. ++p Incorrect H. +++ Correct MA

ff3b_6389

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 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.
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
rusty, waxy, xanthic	r	w	x	393
rusty, waxy	r	w	+	1,012
rusty, xanthic	r	+	x	173
rusty	r	+	+	1,984
waxy, xanthic	+	w	x	2,084
waxy	+	w	+	151
xanthic	+	+	x	1,040
wildtype	+	+	+	363
TOTAL =				7,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. rwx Incorrect B. rw+ Incorrect C. r+x Correct D. r++ Incorrect E. +wx Incorrect F. +w+ Correct G. ++x Incorrect H. +++ Incorrect MA

bd3d_1c0f

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 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 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
artsy, bumpy, yucky	a	b	y	116
artsy, bumpy	a	b	+	521
artsy, yucky	a	+	y	207
artsy	a	+	+	7
bumpy, yucky	+	b	y	10
bumpy	+	b	+	201
yucky	+	+	y	533
wildtype	+	+	+	105
TOTAL =				1,700

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. aby Incorrect B. ab+ Incorrect C. a+y Incorrect D. a++ Correct E. +by Correct F. +b+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

4b17_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 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 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 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	802
nerdy, prickly	n	p	+	181
nerdy, tipsy	n	+	t	1,894
nerdy	n	+	+	53
prickly, tipsy	+	p	t	37
prickly	+	p	+	1,916
tipsy	+	+	t	209
wildtype	+	+	+	908
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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

8991_26e8

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 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 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
artsy, dewy, waxy	a	d	w	608
artsy, dewy	a	d	+	13
artsy, waxy	a	+	w	2,550
artsy	a	+	+	145
dewy, waxy	+	d	w	152
dewy	+	d	+	2,565
waxy	+	+	w	20
wildtype	+	+	+	547
TOTAL =				6,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. adw Incorrect B. ad+ Correct C. a+w Incorrect D. a++ Incorrect E. +dw Incorrect F. +d+ Incorrect G. ++w Correct H. +++ Incorrect MA

de52_b113

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 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 X is correlated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.
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
dewy, xanthic, yucky	d	x	y	28
dewy, xanthic	d	x	+	1,436
dewy, yucky	d	+	y	146
dewy	d	+	+	497
xanthic, yucky	+	x	y	490
xanthic	+	x	+	169
yucky	+	+	y	1,399
wildtype	+	+	+	35
TOTAL =				4,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. dxy Correct B. dx+ Incorrect C. d+y Incorrect D. d++ Incorrect E. +xy Incorrect F. +x+ Incorrect G. ++y Incorrect H. +++ Correct MA

cc4c_b636

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 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 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.

Phenotype	Genotypes			Progeny Count
dewy, eery, jerky	d	e	j	432
dewy, eery	d	e	+	120
dewy, jerky	d	+	j	1,033
dewy	d	+	+	3,054
eery, jerky	+	e	j	2,972
eery	+	e	+	1,037
jerky	+	+	j	110
wildtype	+	+	+	442
TOTAL =				9,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. dej Incorrect B. de+ Correct C. d+j Incorrect D. d++ Incorrect E. +ej Incorrect F. +e+ Incorrect G. ++j Correct H. +++ Incorrect MA

fc43_a3e6

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 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 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 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, fuzzy, prickly	d	f	p	139
dewy, fuzzy	d	f	+	533
dewy, prickly	d	+	p	1,792
dewy	d	+	+	614
fuzzy, prickly	+	f	p	657
fuzzy	+	f	+	1,773
prickly	+	+	p	552
wildtype	+	+	+	140
TOTAL =				6,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. dfp Correct B. df+ Incorrect C. d+p Incorrect D. d++ Incorrect E. +fp Incorrect F. +f+ Incorrect G. ++p Incorrect H. +++ Correct MA

2fe2_1b6d

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 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 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 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
chummy, rusty, tipsy	c	r	t	840
chummy, rusty	c	r	+	1,512
chummy, tipsy	c	+	t	103
chummy	c	+	+	41
rusty, tipsy	+	r	t	34
rusty	+	r	+	122
tipsy	+	+	t	1,513
wildtype	+	+	+	835
TOTAL =				5,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. crt Incorrect B. cr+ Incorrect C. c+t Incorrect D. c++ Correct E. +rt Correct F. +r+ Incorrect G. ++t Incorrect H. +++ Incorrect MA

00cc_ddad

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 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 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 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
eery, nerdy, rusty	e	n	r	2,645
eery, nerdy	e	n	+	1,175
eery, rusty	e	+	r	56
eery	e	+	+	204
nerdy, rusty	+	n	r	258
nerdy	+	n	+	70
rusty	+	+	r	1,219
wildtype	+	+	+	2,773
TOTAL =				8,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. enr Incorrect B. en+ Incorrect C. e+r Correct D. e++ Incorrect E. +nr Incorrect F. +n+ Correct G. ++r Incorrect H. +++ Incorrect MA

8b95_c04f

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 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 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, nerdy, tipsy	a	n	t	243
artsy, nerdy	a	n	+	168
artsy, tipsy	a	+	t	815
artsy	a	+	+	10
nerdy, tipsy	+	n	t	15
nerdy	+	n	+	835
tipsy	+	+	t	182
wildtype	+	+	+	232
TOTAL =				2,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ant Incorrect B. an+ Incorrect C. a+t Incorrect D. a++ Correct E. +nt Correct F. +n+ Incorrect G. ++t Incorrect H. +++ Incorrect MA

4208_19b7

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 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 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
artsy, horsey, waxy	a	h	w	944
artsy, horsey	a	h	+	632
artsy, waxy	a	+	w	180
artsy	a	+	+	2,394
horsey, waxy	+	h	w	2,436
horsey	+	h	+	198
waxy	+	+	w	670
wildtype	+	+	+	946
TOTAL =				8,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ahw Incorrect B. ah+ Incorrect C. a+w Correct D. a++ Incorrect E. +hw Incorrect F. +h+ Correct G. ++w Incorrect H. +++ Incorrect MA

4342_cebe

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 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 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 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
chummy, nerdy, waxy	c	n	w	138
chummy, nerdy	c	n	+	584
chummy, waxy	c	+	w	11
chummy	c	+	+	239
nerdy, waxy	+	n	w	231
nerdy	+	n	+	19
waxy	+	+	w	626
wildtype	+	+	+	152
TOTAL =				2,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cnw Incorrect B. cn+ Incorrect C. c+w Correct D. c++ Incorrect E. +nw Incorrect F. +n+ Correct G. ++w Incorrect H. +++ Incorrect MA

48eb_b229

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 linked 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 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 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
bumpy, chummy, rusty	b	c	r	18
bumpy, chummy	b	c	+	301
bumpy, rusty	b	+	r	1,480
bumpy	b	+	+	167
chummy, rusty	+	c	r	193
chummy	+	c	+	1,520
rusty	+	+	r	299
wildtype	+	+	+	22
TOTAL =				4,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bcr Correct B. bc+ Incorrect C. b+r Incorrect D. b++ Incorrect E. +cr Incorrect F. +c+ Incorrect G. ++r Incorrect H. +++ Correct MA

5e19_6cb5

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 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 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
bumpy, jerky, xanthic	b	j	x	98
bumpy, jerky	b	j	+	1,202
bumpy, xanthic	b	+	x	2,957
bumpy	b	+	+	341
jerky, xanthic	+	j	x	399
jerky	+	j	+	2,963
xanthic	+	+	x	1,203
wildtype	+	+	+	87
TOTAL =				9,250

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bjx Correct B. bj+ Incorrect C. b+x Incorrect D. b++ Incorrect E. +jx Incorrect F. +j+ Incorrect G. ++x Incorrect H. +++ Correct MA

449d_d511

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 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 W is analogous 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
eery, fuzzy, waxy	e	f	w	20
eery, fuzzy	e	f	+	972
eery, waxy	e	+	w	360
eery	e	+	+	215
fuzzy, waxy	+	f	w	217
fuzzy	+	f	+	392
waxy	+	+	w	996
wildtype	+	+	+	28
TOTAL =				3,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. efw Correct B. ef+ Incorrect C. e+w Incorrect D. e++ Incorrect E. +fw Incorrect F. +f+ Incorrect G. ++w Incorrect H. +++ Correct MA

85ef_bd6d

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 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 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.
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
prickly, rusty, yucky	p	r	y	380
prickly, rusty	p	r	+	64
prickly, yucky	p	+	y	911
prickly	p	+	+	3,245
rusty, yucky	+	r	y	3,241
rusty	+	r	+	883
yucky	+	+	y	74
wildtype	+	+	+	402
TOTAL =				9,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. pry Incorrect B. pr+ Correct C. p+y Incorrect D. p++ Incorrect E. +ry Incorrect F. +r+ Incorrect G. ++y Correct H. +++ Incorrect MA

7e41_ca15

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 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 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, jerky, waxy	d	j	w	136
dewy, jerky	d	j	+	2,277
dewy, waxy	d	+	w	14
dewy	d	+	+	796
jerky, waxy	+	j	w	772
jerky	+	j	+	18
waxy	+	+	w	2,235
wildtype	+	+	+	152
TOTAL =				6,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. djw Incorrect B. dj+ Incorrect C. d+w Correct D. d++ Incorrect E. +jw Incorrect F. +j+ Correct G. ++w Incorrect H. +++ Incorrect MA

c659_711f

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 correlated 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 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 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
kidney, nerdy, yucky	k	n	y	52
kidney, nerdy	k	n	+	1,569
kidney, yucky	k	+	y	649
kidney	k	+	+	191
nerdy, yucky	+	n	y	205
nerdy	+	n	+	638
yucky	+	+	y	1,599
wildtype	+	+	+	47
TOTAL =				4,950

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. kny Correct B. kn+ Incorrect C. k+y Incorrect D. k++ Incorrect E. +ny Incorrect F. +n+ Incorrect G. ++y Incorrect H. +++ Correct MA

fc05_b503

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 associated 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.
Gene X is linked with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
mushy, waxy, xanthic	m	w	x	11
mushy, waxy	m	w	+	465
mushy, xanthic	m	+	x	50
mushy	m	+	+	163
waxy, xanthic	+	w	x	166
waxy	+	w	+	55
xanthic	+	+	x	480
wildtype	+	+	+	10
TOTAL =				1,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. mwx Correct B. mw+ Incorrect C. m+x Incorrect D. m++ Incorrect E. +wx Incorrect F. +w+ Incorrect G. ++x Incorrect H. +++ Correct MA

5283_fe06

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 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 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 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.

Phenotype	Genotypes			Progeny Count
chummy, dewy, nerdy	c	d	n	600
chummy, dewy	c	d	+	95
chummy, nerdy	c	+	n	30
chummy	c	+	+	1,115
dewy, nerdy	+	d	n	1,063
dewy	+	d	+	24
nerdy	+	+	n	67
wildtype	+	+	+	606
TOTAL =				3,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cdn Incorrect B. cd+ Incorrect C. c+n Correct D. c++ Incorrect E. +dn Incorrect F. +d+ Correct G. ++n Incorrect H. +++ Incorrect MA

1d88_4cd1

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 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 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 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.

Phenotype	Genotypes			Progeny Count
chummy, kidney, mushy	c	k	m	63
chummy, kidney	c	k	+	628
chummy, mushy	c	+	m	304
chummy	c	+	+	1,858
kidney, mushy	+	k	m	1,847
kidney	+	k	+	266
mushy	+	+	m	683
wildtype	+	+	+	51
TOTAL =				5,700

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ckm Correct B. ck+ Incorrect C. c+m Incorrect D. c++ Incorrect E. +km Incorrect F. +k+ Incorrect G. ++m Incorrect H. +++ Correct MA

b00f_d612

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 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 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.

Phenotype	Genotypes			Progeny Count
artsy, chummy, mushy	a	c	m	30
artsy, chummy	a	c	+	235
artsy, mushy	a	+	m	734
artsy	a	+	+	2,208
chummy, mushy	+	c	m	2,144
chummy	+	c	+	802
mushy	+	+	m	213
wildtype	+	+	+	34
TOTAL =				6,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. acm Correct B. ac+ Incorrect C. a+m Incorrect D. a++ Incorrect E. +cm Incorrect F. +c+ Incorrect G. ++m Incorrect H. +++ Correct MA

bc8e_d511

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 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 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
eery, fuzzy, waxy	e	f	w	98
eery, fuzzy	e	f	+	630
eery, waxy	e	+	w	366
eery	e	+	+	2,106
fuzzy, waxy	+	f	w	2,250
fuzzy	+	f	+	426
waxy	+	+	w	624
wildtype	+	+	+	100
TOTAL =				6,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. efw Correct B. ef+ Incorrect C. e+w Incorrect D. e++ Incorrect E. +fw Incorrect F. +f+ Incorrect G. ++w Incorrect H. +++ Correct MA

8340_33cb

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 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 correlated 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
bumpy, horsey, kidney	b	h	k	28
bumpy, horsey	b	h	+	171
bumpy, kidney	b	+	k	1,598
bumpy	b	+	+	564
horsey, kidney	+	h	k	612
horsey	+	h	+	1,734
kidney	+	+	k	172
wildtype	+	+	+	21
TOTAL =				4,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bhk Correct B. bh+ Incorrect C. b+k Incorrect D. b++ Incorrect E. +hk Incorrect F. +h+ Incorrect G. ++k Incorrect H. +++ Correct MA

2abf_bce2

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 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 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
eery, jerky, prickly	e	j	p	2,574
eery, jerky	e	j	+	94
eery, prickly	e	+	p	495
eery	e	+	+	674
jerky, prickly	+	j	p	677
jerky	+	j	+	470
prickly	+	+	p	99
wildtype	+	+	+	2,637
TOTAL =				7,720

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ejp Incorrect B. ej+ Correct C. e+p Incorrect D. e++ Incorrect E. +jp Incorrect F. +j+ Incorrect G. ++p Correct H. +++ Incorrect MA

49a2_e0f0

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 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.
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
prickly, tipsy, xanthic	p	t	x	765
prickly, tipsy	p	t	+	555
prickly, xanthic	p	+	x	2,049
prickly	p	+	+	118
tipsy, xanthic	+	t	x	92
tipsy	+	t	+	2,151
xanthic	+	+	x	495
wildtype	+	+	+	775
TOTAL =				7,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ptx Incorrect B. pt+ Incorrect C. p+x Incorrect D. p++ Correct E. +tx Correct F. +t+ Incorrect G. ++x Incorrect H. +++ Incorrect MA

8e4b_c6b6

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 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 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.

Phenotype	Genotypes			Progeny Count
bumpy, dewy, jerky	b	d	j	34
bumpy, dewy	b	d	+	564
bumpy, jerky	b	+	j	135
bumpy	b	+	+	1,207
dewy, jerky	+	d	j	1,168
dewy	+	d	+	150
jerky	+	+	j	519
wildtype	+	+	+	23
TOTAL =				3,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bdj Correct B. bd+ Incorrect C. b+j Incorrect D. b++ Incorrect E. +dj Incorrect F. +d+ Incorrect G. ++j Incorrect H. +++ Correct MA

9663_bd6d

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 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 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.
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
prickly, rusty, yucky	p	r	y	104
prickly, rusty	p	r	+	1,081
prickly, yucky	p	+	y	344
prickly	p	+	+	3,332
rusty, yucky	+	r	y	3,196
rusty	+	r	+	328
yucky	+	+	y	1,127
wildtype	+	+	+	88
TOTAL =				9,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. pry Correct B. pr+ Incorrect C. p+y Incorrect D. p++ Incorrect E. +ry Incorrect F. +r+ Incorrect G. ++y Incorrect H. +++ Correct MA

843e_e78f

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 correlated 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 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 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
kidney, prickly, rusty	k	p	r	150
kidney, prickly	k	p	+	3
kidney, rusty	k	+	r	458
kidney	k	+	+	70
prickly, rusty	+	p	r	84
prickly	+	p	+	508
rusty	+	+	r	11
wildtype	+	+	+	116
TOTAL =				1,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. kpr Incorrect B. kp+ Correct C. k+r Incorrect D. k++ Incorrect E. +pr Incorrect F. +p+ Incorrect G. ++r Correct H. +++ Incorrect MA

a310_8c59

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 linked 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 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.
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
bumpy, waxy, yucky	b	w	y	1,937
bumpy, waxy	b	w	+	26
bumpy, yucky	b	+	y	300
bumpy	b	+	+	239
waxy, yucky	+	w	y	220
waxy	+	w	+	363
yucky	+	+	y	25
wildtype	+	+	+	1,990
TOTAL =				5,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bwy Incorrect B. bw+ Correct C. b+y Incorrect D. b++ Incorrect E. +wy Incorrect F. +w+ Incorrect G. ++y Correct H. +++ Incorrect MA

03f7_d511

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 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 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 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
eery, fuzzy, waxy	e	f	w	16
eery, fuzzy	e	f	+	1,059
eery, waxy	e	+	w	1,787
eery	e	+	+	140
fuzzy, waxy	+	f	w	130
fuzzy	+	f	+	1,843
waxy	+	+	w	1,011
wildtype	+	+	+	14
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. efw Correct B. ef+ Incorrect C. e+w Incorrect D. e++ Incorrect E. +fw Incorrect F. +f+ Incorrect G. ++w Incorrect H. +++ Correct MA

4c1d_8c59

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 linked 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 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 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
bumpy, waxy, yucky	b	w	y	1,325
bumpy, waxy	b	w	+	584
bumpy, yucky	b	+	y	97
bumpy	b	+	+	262
waxy, yucky	+	w	y	278
waxy	+	w	+	83
yucky	+	+	y	586
wildtype	+	+	+	1,285
TOTAL =				4,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bwy Incorrect B. bw+ Incorrect C. b+y Correct D. b++ Incorrect E. +wy Incorrect F. +w+ Correct G. ++y Incorrect H. +++ Incorrect MA

3a13_ddd0

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 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 M is analogous 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
bumpy, jerky, mushy	b	j	m	151
bumpy, jerky	b	j	+	693
bumpy, mushy	b	+	m	2,451
bumpy	b	+	+	616
jerky, mushy	+	j	m	656
jerky	+	j	+	2,478
mushy	+	+	m	738
wildtype	+	+	+	167
TOTAL =				7,950

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bjm Correct B. bj+ Incorrect C. b+m Incorrect D. b++ Incorrect E. +jm Incorrect F. +j+ Incorrect G. ++m Incorrect H. +++ Correct MA

7773_e28f

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 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 M is associated 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.

Phenotype	Genotypes			Progeny Count
bumpy, fuzzy, mushy	b	f	m	1,759
bumpy, fuzzy	b	f	+	244
bumpy, mushy	b	+	m	27
bumpy	b	+	+	845
fuzzy, mushy	+	f	m	779
fuzzy	+	f	+	29
mushy	+	+	m	260
wildtype	+	+	+	1,657
TOTAL =				5,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bfm Incorrect B. bf+ Incorrect C. b+m Correct D. b++ Incorrect E. +fm Incorrect F. +f+ Correct G. ++m Incorrect H. +++ Incorrect MA

7299_e09a

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 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 M is analogous 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
dewy, eery, mushy	d	e	m	1,292
dewy, eery	d	e	+	168
dewy, mushy	d	+	m	530
dewy	d	+	+	2,766
eery, mushy	+	e	m	2,850
eery	+	e	+	574
mushy	+	+	m	168
wildtype	+	+	+	1,252
TOTAL =				9,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. dem Incorrect B. de+ Correct C. d+m Incorrect D. d++ Incorrect E. +em Incorrect F. +e+ Incorrect G. ++m Correct H. +++ Incorrect MA

f5be_ddef

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 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.
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
bumpy, kidney, xanthic	b	k	x	2,085
bumpy, kidney	b	k	+	56
bumpy, xanthic	b	+	x	522
bumpy	b	+	+	264
kidney, xanthic	+	k	x	267
kidney	+	k	+	540
xanthic	+	+	x	62
wildtype	+	+	+	2,104
TOTAL =				5,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bkx Incorrect B. bk+ Correct C. b+x Incorrect D. b++ Incorrect E. +kx Incorrect F. +k+ Incorrect G. ++x Correct H. +++ Incorrect MA

dbcd_b918

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 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 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 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
bumpy, eery, tipsy	b	e	t	34
bumpy, eery	b	e	+	1,448
bumpy, tipsy	b	+	t	198
bumpy	b	+	+	507
eery, tipsy	+	e	t	527
eery	+	e	+	220
tipsy	+	+	t	1,434
wildtype	+	+	+	32
TOTAL =				4,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bet Correct B. be+ Incorrect C. b+t Incorrect D. b++ Incorrect E. +et Incorrect F. +e+ Incorrect G. ++t Incorrect H. +++ Correct MA

357e_8c59

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 linked 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 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.
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
bumpy, waxy, yucky	b	w	y	2,717
bumpy, waxy	b	w	+	939
bumpy, yucky	b	+	y	20
bumpy	b	+	+	89
waxy, yucky	+	w	y	96
waxy	+	w	+	17
yucky	+	+	y	874
wildtype	+	+	+	2,648
TOTAL =				7,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bwy Incorrect B. bw+ Incorrect C. b+y Correct D. b++ Incorrect E. +wy Incorrect F. +w+ Correct G. ++y Incorrect H. +++ Incorrect MA

7941_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 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 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 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.

Phenotype	Genotypes			Progeny Count
dewy, fuzzy, jerky	d	f	j	3,186
dewy, fuzzy	d	f	+	832
dewy, jerky	d	+	j	464
dewy	d	+	+	89
fuzzy, jerky	+	f	j	93
fuzzy	+	f	+	446
jerky	+	+	j	806
wildtype	+	+	+	3,184
TOTAL =				9,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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

94b0_034f

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 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.
Gene W is analogous 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
eery, tipsy, waxy	e	t	w	1,046
eery, tipsy	e	t	+	171
eery, waxy	e	+	w	361
eery	e	+	+	47
tipsy, waxy	+	t	w	33
tipsy	+	t	+	359
waxy	+	+	w	133
wildtype	+	+	+	1,050
TOTAL =				3,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. etw Incorrect B. et+ Incorrect C. e+w Incorrect D. e++ Correct E. +tw Correct F. +t+ Incorrect G. ++w Incorrect H. +++ Incorrect MA

c003_9397

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 linked 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 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 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.

Phenotype	Genotypes			Progeny Count
bumpy, jerky, nerdy	b	j	n	316
bumpy, jerky	b	j	+	79
bumpy, nerdy	b	+	n	2,584
bumpy	b	+	+	653
jerky, nerdy	+	j	n	661
jerky	+	j	+	2,599
nerdy	+	+	n	67
wildtype	+	+	+	341
TOTAL =				7,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bjn Incorrect B. bj+ Correct C. b+n Incorrect D. b++ Incorrect E. +jn Incorrect F. +j+ Incorrect G. ++n Correct H. +++ Incorrect MA

de60_7aa5

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 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 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 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
jerky, kidney, rusty	j	k	r	71
jerky, kidney	j	k	+	1,206
jerky, rusty	j	+	r	584
jerky	j	+	+	19
kidney, rusty	+	k	r	19
kidney	+	k	+	594
rusty	+	+	r	1,226
wildtype	+	+	+	81
TOTAL =				3,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. jkr Incorrect B. jk+ Incorrect C. j+r Incorrect D. j++ Correct E. +kr Correct F. +k+ Incorrect G. ++r Incorrect H. +++ Incorrect MA

9043_a3a1

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 K is analogous 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 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.

Phenotype	Genotypes			Progeny Count
fuzzy, kidney, nerdy	f	k	n	90
fuzzy, kidney	f	k	+	3,092
fuzzy, nerdy	f	+	n	797
fuzzy	f	+	+	629
kidney, nerdy	+	k	n	687
kidney	+	k	+	895
nerdy	+	+	n	3,112
wildtype	+	+	+	98
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. fkn Correct B. fk+ Incorrect C. f+n Incorrect D. f++ Incorrect E. +kn Incorrect F. +k+ Incorrect G. ++n Incorrect H. +++ Correct MA

1c58_426b

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 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 X is connected with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.
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
kidney, xanthic, yucky	k	x	y	2,171
kidney, xanthic	k	x	+	472
kidney, yucky	k	+	y	17
kidney	k	+	+	810
xanthic, yucky	+	x	y	905
xanthic	+	x	+	18
yucky	+	+	y	473
wildtype	+	+	+	2,134
TOTAL =				7,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. kxy Incorrect B. kx+ Incorrect C. k+y Correct D. k++ Incorrect E. +xy Incorrect F. +x+ Correct G. ++y Incorrect H. +++ Incorrect MA

fdd7_6fcd

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 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 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
chummy, tipsy, yucky	c	t	y	9
chummy, tipsy	c	t	+	940
chummy, yucky	c	+	y	345
chummy	c	+	+	112
tipsy, yucky	+	t	y	126
tipsy	+	t	+	341
yucky	+	+	y	922
wildtype	+	+	+	5
TOTAL =				2,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cty Correct B. ct+ Incorrect C. c+y Incorrect D. c++ Incorrect E. +ty Incorrect F. +t+ Incorrect G. ++y Incorrect H. +++ Correct MA

6b54_86b4

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 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 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, fuzzy, rusty	a	f	r	900
artsy, fuzzy	a	f	+	25
artsy, rusty	a	+	r	303
artsy	a	+	+	90
fuzzy, rusty	+	f	r	92
fuzzy	+	f	+	295
rusty	+	+	r	27
wildtype	+	+	+	868
TOTAL =				2,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. afr Incorrect B. af+ Correct C. a+r Incorrect D. a++ Incorrect E. +fr Incorrect F. +f+ Incorrect G. ++r Correct H. +++ Incorrect MA

8b65_9529

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 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 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
chummy, mushy, nerdy	c	m	n	16
chummy, mushy	c	m	+	933
chummy, nerdy	c	+	n	77
chummy	c	+	+	229
mushy, nerdy	+	m	n	246
mushy	+	m	+	73
nerdy	+	+	n	917
wildtype	+	+	+	9
TOTAL =				2,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cmn Correct B. cm+ Incorrect C. c+n Incorrect D. c++ Incorrect E. +mn Incorrect F. +m+ Incorrect G. ++n Incorrect H. +++ Correct MA

9b83_3925

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 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 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 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
fuzzy, nerdy, prickly	f	n	p	303
fuzzy, nerdy	f	n	+	141
fuzzy, prickly	f	+	p	1,324
fuzzy	f	+	+	2,609
nerdy, prickly	+	n	p	2,611
nerdy	+	n	+	1,286
prickly	+	+	p	120
wildtype	+	+	+	306
TOTAL =				8,700

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. fnp Incorrect B. fn+ Correct C. f+p Incorrect D. f++ Incorrect E. +np Incorrect F. +n+ Incorrect G. ++p Correct H. +++ Incorrect MA

458a_99c8

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 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 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
bumpy, fuzzy, yucky	b	f	y	2,468
bumpy, fuzzy	b	f	+	891
bumpy, yucky	b	+	y	708
bumpy	b	+	+	189
fuzzy, yucky	+	f	y	198
fuzzy	+	f	+	711
yucky	+	+	y	872
wildtype	+	+	+	2,563
TOTAL =				8,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bfy Incorrect B. bf+ Incorrect C. b+y Incorrect D. b++ Correct E. +fy Correct F. +f+ Incorrect G. ++y Incorrect H. +++ Incorrect MA

af20_e559

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 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 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, tipsy, xanthic	a	t	x	19
artsy, tipsy	a	t	+	217
artsy, xanthic	a	+	x	123
artsy	a	+	+	586
tipsy, xanthic	+	t	x	592
tipsy	+	t	+	124
xanthic	+	+	x	201
wildtype	+	+	+	38
TOTAL =				1,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. atx Correct B. at+ Incorrect C. a+x Incorrect D. a++ Incorrect E. +tx Incorrect F. +t+ Incorrect G. ++x Incorrect H. +++ Correct MA

cc29_d3d2

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 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 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
chummy, eery, horsey	c	e	h	3,244
chummy, eery	c	e	+	151
chummy, horsey	c	+	h	22
chummy	c	+	+	846
eery, horsey	+	e	h	792
eery	+	e	+	20
horsey	+	+	h	143
wildtype	+	+	+	3,182
TOTAL =				8,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ceh Incorrect B. ce+ Incorrect C. c+h Correct D. c++ Incorrect E. +eh Incorrect F. +e+ Correct G. ++h Incorrect H. +++ Incorrect MA

ea6c_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 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 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 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
dewy, nerdy, tipsy	d	n	t	451
dewy, nerdy	d	n	+	638
dewy, tipsy	d	+	t	15
dewy	d	+	+	2,049
nerdy, tipsy	+	n	t	2,143
nerdy	+	n	+	17
tipsy	+	+	t	610
wildtype	+	+	+	477
TOTAL =				6,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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

0d0e_10a9

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 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 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, dewy, prickly	b	d	p	335
bumpy, dewy	b	d	+	140
bumpy, prickly	b	+	p	22
bumpy	b	+	+	66
dewy, prickly	+	d	p	72
dewy	+	d	+	20
prickly	+	+	p	154
wildtype	+	+	+	391
TOTAL =				1,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bdp Incorrect B. bd+ Incorrect C. b+p Correct D. b++ Incorrect E. +dp Incorrect F. +d+ Correct G. ++p Incorrect H. +++ Incorrect MA

1605_33cb

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 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 K is correlated 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
bumpy, horsey, kidney	b	h	k	2,743
bumpy, horsey	b	h	+	227
bumpy, kidney	b	+	k	1,108
bumpy	b	+	+	759
horsey, kidney	+	h	k	698
horsey	+	h	+	1,007
kidney	+	+	k	196
wildtype	+	+	+	2,662
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bhk Incorrect B. bh+ Correct C. b+k Incorrect D. b++ Incorrect E. +hk Incorrect F. +h+ Incorrect G. ++k Correct H. +++ Incorrect MA

7385_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 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 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 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
chummy, dewy, tipsy	c	d	t	131
chummy, dewy	c	d	+	1,837
chummy, tipsy	c	+	t	634
chummy	c	+	+	418
dewy, tipsy	+	d	t	436
dewy	+	d	+	647
tipsy	+	+	t	1,884
wildtype	+	+	+	113
TOTAL =				6,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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

f51b_46b8

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 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
nerdy, prickly, rusty	n	p	r	503
nerdy, prickly	n	p	+	102
nerdy, rusty	n	+	r	25
nerdy	n	+	+	2
prickly, rusty	+	p	r	4
prickly	+	p	+	29
rusty	+	+	r	108
wildtype	+	+	+	427
TOTAL =				1,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. npr Incorrect B. np+ Incorrect C. n+r Incorrect D. n++ Correct E. +pr Correct F. +p+ Incorrect G. ++r Incorrect H. +++ Incorrect MA

08b6_8223

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 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 W is analogous 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
artsy, tipsy, waxy	a	t	w	126
artsy, tipsy	a	t	+	1,052
artsy, waxy	a	+	w	465
artsy	a	+	+	2,350
tipsy, waxy	+	t	w	2,330
tipsy	+	t	+	455
waxy	+	+	w	1,068
wildtype	+	+	+	154
TOTAL =				8,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. atw Correct B. at+ Incorrect C. a+w Incorrect D. a++ Incorrect E. +tw Incorrect F. +t+ Incorrect G. ++w Incorrect H. +++ Correct MA

a61d_0c58

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 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 X is linked 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, jerky, xanthic	a	j	x	180
artsy, jerky	a	j	+	2,272
artsy, xanthic	a	+	x	586
artsy	a	+	+	13
jerky, xanthic	+	j	x	18
jerky	+	j	+	623
xanthic	+	+	x	2,347
wildtype	+	+	+	161
TOTAL =				6,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ajx Incorrect B. aj+ Incorrect C. a+x Incorrect D. a++ Correct E. +jx Correct F. +j+ Incorrect G. ++x Incorrect H. +++ Incorrect MA

80ef_aabc

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 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 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
bumpy, prickly, yucky	b	p	y	107
bumpy, prickly	b	p	+	385
bumpy, yucky	b	+	y	529
bumpy	b	+	+	1,486
prickly, yucky	+	p	y	1,489
prickly	+	p	+	496
yucky	+	+	y	390
wildtype	+	+	+	118
TOTAL =				5,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bpy Correct B. bp+ Incorrect C. b+y Incorrect D. b++ Incorrect E. +py Incorrect F. +p+ Incorrect G. ++y Incorrect H. +++ Correct MA

dfd9_4f5c

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 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 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.

Phenotype	Genotypes			Progeny Count
chummy, eery, nerdy	c	e	n	2,426
chummy, eery	c	e	+	20
chummy, nerdy	c	+	n	903
chummy	c	+	+	435
eery, nerdy	+	e	n	439
eery	+	e	+	959
nerdy	+	+	n	18
wildtype	+	+	+	2,400
TOTAL =				7,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cen Incorrect B. ce+ Correct C. c+n Incorrect D. c++ Incorrect E. +en Incorrect F. +e+ Incorrect G. ++n Correct H. +++ Incorrect MA

9a98_dfb8

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 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 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 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
chummy, mushy, rusty	c	m	r	175
chummy, mushy	c	m	+	352
chummy, rusty	c	+	r	3
chummy	c	+	+	59
mushy, rusty	+	m	r	55
mushy	+	m	+	3
rusty	+	+	r	374
wildtype	+	+	+	179
TOTAL =				1,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cmr Incorrect B. cm+ Incorrect C. c+r Correct D. c++ Incorrect E. +mr Incorrect F. +m+ Correct G. ++r Incorrect H. +++ Incorrect MA

8fff_f95d

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 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 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
chummy, jerky, rusty	c	j	r	2,552
chummy, jerky	c	j	+	319
chummy, rusty	c	+	r	55
chummy	c	+	+	700
jerky, rusty	+	j	r	704
jerky	+	j	+	53
rusty	+	+	r	293
wildtype	+	+	+	2,524
TOTAL =				7,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cjr Incorrect B. cj+ Incorrect C. c+r Correct D. c++ Incorrect E. +jr Incorrect F. +j+ Correct G. ++r Incorrect H. +++ Incorrect MA

abd3_18d9

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 B is linked 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 linked 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, bumpy, fuzzy	a	b	f	235
artsy, bumpy	a	b	+	1,948
artsy, fuzzy	a	+	f	859
artsy	a	+	+	73
bumpy, fuzzy	+	b	f	82
bumpy	+	b	+	846
fuzzy	+	+	f	1,927
wildtype	+	+	+	230
TOTAL =				6,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. abf Incorrect B. ab+ Incorrect C. a+f Incorrect D. a++ Correct E. +bf Correct F. +b+ Incorrect G. ++f Incorrect H. +++ Incorrect MA

7954_0073

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 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 X is linked 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, prickly, xanthic	a	p	x	212
artsy, prickly	a	p	+	872
artsy, xanthic	a	+	x	2,640
artsy	a	+	+	783
prickly, xanthic	+	p	x	764
prickly	+	p	+	2,638
xanthic	+	+	x	948
wildtype	+	+	+	243
TOTAL =				9,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. apx Correct B. ap+ Incorrect C. a+x Incorrect D. a++ Incorrect E. +px Incorrect F. +p+ Incorrect G. ++x Incorrect H. +++ Correct MA

50d4_2f7b

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 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 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
artsy, tipsy, yucky	a	t	y	144
artsy, tipsy	a	t	+	1,837
artsy, yucky	a	+	y	37
artsy	a	+	+	597
tipsy, yucky	+	t	y	625
tipsy	+	t	+	41
yucky	+	+	y	1,777
wildtype	+	+	+	142
TOTAL =				5,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. aty Incorrect B. at+ Incorrect C. a+y Correct D. a++ Incorrect E. +ty Incorrect F. +t+ Correct G. ++y Incorrect H. +++ Incorrect MA

0bb5_7720

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 K is analogous 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 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
artsy, kidney, yucky	a	k	y	144
artsy, kidney	a	k	+	1,488
artsy, yucky	a	+	y	62
artsy	a	+	+	2,579
kidney, yucky	+	k	y	2,624
kidney	+	k	+	67
yucky	+	+	y	1,479
wildtype	+	+	+	157
TOTAL =				8,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. aky Incorrect B. ak+ Incorrect C. a+y Correct D. a++ Incorrect E. +ky Incorrect F. +k+ Correct G. ++y Incorrect H. +++ Incorrect MA

6611_a5ef

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 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.
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
chummy, tipsy, xanthic	c	t	x	1,072
chummy, tipsy	c	t	+	111
chummy, xanthic	c	+	x	590
chummy	c	+	+	2,894
tipsy, xanthic	+	t	x	2,956
tipsy	+	t	+	580
xanthic	+	+	x	123
wildtype	+	+	+	1,034
TOTAL =				9,360

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ctx Incorrect B. ct+ Correct C. c+x Incorrect D. c++ Incorrect E. +tx Incorrect F. +t+ Incorrect G. ++x Correct H. +++ Incorrect MA

eeb6_b2d0

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 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 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 Y is connected 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
kidney, mushy, yucky	k	m	y	60
kidney, mushy	k	m	+	2,877
kidney, yucky	k	+	y	336
kidney	k	+	+	774
mushy, yucky	+	m	y	706
mushy	+	m	+	344
yucky	+	+	y	2,843
wildtype	+	+	+	60
TOTAL =				8,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. kmy Correct B. km+ Incorrect C. k+y Incorrect D. k++ Incorrect E. +my Incorrect F. +m+ Incorrect G. ++y Incorrect H. +++ Correct MA

0f45_27bf

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 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 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 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
chummy, prickly, waxy	c	p	w	231
chummy, prickly	c	p	+	3,195
chummy, waxy	c	+	w	1,420
chummy	c	+	+	50
prickly, waxy	+	p	w	48
prickly	+	p	+	1,422
waxy	+	+	w	3,175
wildtype	+	+	+	259
TOTAL =				9,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. cpw Incorrect B. cp+ Incorrect C. c+w Incorrect D. c++ Correct E. +pw Correct F. +p+ Incorrect G. ++w Incorrect H. +++ Incorrect MA

c9ed_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 correlated 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.
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
kidney, prickly, xanthic	k	p	x	2,083
kidney, prickly	k	p	+	812
kidney, xanthic	k	+	x	52
kidney	k	+	+	293
prickly, xanthic	+	p	x	251
prickly	+	p	+	44
xanthic	+	+	x	820
wildtype	+	+	+	2,045
TOTAL =				6,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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

7816_8c59

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 linked 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 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 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
bumpy, waxy, yucky	b	w	y	94
bumpy, waxy	b	w	+	16
bumpy, yucky	b	+	y	477
bumpy	b	+	+	132
waxy, yucky	+	w	y	120
waxy	+	w	+	461
yucky	+	+	y	12
wildtype	+	+	+	88
TOTAL =				1,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bwy Incorrect B. bw+ Correct C. b+y Incorrect D. b++ Incorrect E. +wy Incorrect F. +w+ Incorrect G. ++y Correct H. +++ Incorrect MA

69d7_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 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 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	1,442
jerky, xanthic	j	x	+	12
jerky, yucky	j	+	y	89
jerky	j	+	+	234
xanthic, yucky	+	x	y	252
xanthic	+	x	+	73
yucky	+	+	y	6
wildtype	+	+	+	1,492
TOTAL =				3,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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

e7cb_b849

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 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 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 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, nerdy, prickly	b	n	p	1,425
bumpy, nerdy	b	n	+	47
bumpy, prickly	b	+	p	602
bumpy	b	+	+	398
nerdy, prickly	+	n	p	386
nerdy	+	n	+	525
prickly	+	+	p	51
wildtype	+	+	+	1,466
TOTAL =				4,900

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bnp Incorrect B. bn+ Correct C. b+p Incorrect D. b++ Incorrect E. +np Incorrect F. +n+ Incorrect G. ++p Correct H. +++ Incorrect MA

233f_fdf6

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 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 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
dewy, nerdy, rusty	d	n	r	6
dewy, nerdy	d	n	+	562
dewy, rusty	d	+	r	128
dewy	d	+	+	182
nerdy, rusty	+	n	r	250
nerdy	+	n	+	106
rusty	+	+	r	554
wildtype	+	+	+	12
TOTAL =				1,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. dnr Correct B. dn+ Incorrect C. d+r Incorrect D. d++ Incorrect E. +nr Incorrect F. +n+ Incorrect G. ++r Incorrect H. +++ Correct MA

54a4_f925

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 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 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
artsy, fuzzy, yucky	a	f	y	813
artsy, fuzzy	a	f	+	8
artsy, yucky	a	+	y	46
artsy	a	+	+	248
fuzzy, yucky	+	f	y	225
fuzzy	+	f	+	53
yucky	+	+	y	3
wildtype	+	+	+	804
TOTAL =				2,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. afy Incorrect B. af+ Correct C. a+y Incorrect D. a++ Incorrect E. +fy Incorrect F. +f+ Incorrect G. ++y Correct H. +++ Incorrect MA

194b_cd41

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 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 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 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
kidney, mushy, rusty	k	m	r	337
kidney, mushy	k	m	+	725
kidney, rusty	k	+	r	94
kidney	k	+	+	1,656
mushy, rusty	+	m	r	1,620
mushy	+	m	+	102
rusty	+	+	r	759
wildtype	+	+	+	307
TOTAL =				5,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. kmr Incorrect B. km+ Incorrect C. k+r Correct D. k++ Incorrect E. +mr Incorrect F. +m+ Correct G. ++r Incorrect H. +++ Incorrect MA

f8b9_1390

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 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 analogous 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
chummy, horsey, kidney	c	h	k	753
chummy, horsey	c	h	+	107
chummy, kidney	c	+	k	25
chummy	c	+	+	1,714
horsey, kidney	+	h	k	1,718
horsey	+	h	+	27
kidney	+	+	k	101
wildtype	+	+	+	755
TOTAL =				5,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. chk Incorrect B. ch+ Incorrect C. c+k Correct D. c++ Incorrect E. +hk Incorrect F. +h+ Correct G. ++k Incorrect H. +++ Incorrect MA

a58a_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 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 analogous 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 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	57
dewy, mushy	d	m	+	1,360
dewy, waxy	d	+	w	232
dewy	d	+	+	457
mushy, waxy	+	m	w	467
mushy	+	m	+	230
waxy	+	+	w	1,328
wildtype	+	+	+	69
TOTAL =				4,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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

6151_371d

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 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 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
bumpy, horsey, tipsy	b	h	t	178
bumpy, horsey	b	h	+	37
bumpy, tipsy	b	+	t	356
bumpy	b	+	+	957
horsey, tipsy	+	h	t	993
horsey	+	h	+	346
tipsy	+	+	t	41
wildtype	+	+	+	212
TOTAL =				3,120

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. bht Incorrect B. bh+ Correct C. b+t Incorrect D. b++ Incorrect E. +ht Incorrect F. +h+ Incorrect G. ++t Correct H. +++ Incorrect MA

f318_cb7e

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 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 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, horsey, rusty	a	h	r	83
artsy, horsey	a	h	+	1,029
artsy, rusty	a	+	r	253
artsy	a	+	+	484
horsey, rusty	+	h	r	434
horsey	+	h	+	233
rusty	+	+	r	1,005
wildtype	+	+	+	79
TOTAL =				3,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. ahr Correct B. ah+ Incorrect C. a+r Incorrect D. a++ Incorrect E. +hr Incorrect F. +h+ Incorrect G. ++r Incorrect H. +++ Correct MA

12d0_a23c

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 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.
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
eery, nerdy, yucky	e	n	y	389
eery, nerdy	e	n	+	116
eery, yucky	e	+	y	10
eery	e	+	+	79
nerdy, yucky	+	n	y	83
nerdy	+	n	+	8
yucky	+	+	y	106
wildtype	+	+	+	409
TOTAL =				1,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. eny Incorrect B. en+ Incorrect C. e+y Correct D. e++ Incorrect E. +ny Incorrect F. +n+ Correct G. ++y Incorrect H. +++ Incorrect MA

1c66_adac

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 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 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.

Phenotype	Genotypes			Progeny Count
horsey, mushy, rusty	h	m	r	304
horsey, mushy	h	m	+	2,613
horsey, rusty	h	+	r	523
horsey	h	+	+	28
mushy, rusty	+	m	r	40
mushy	+	m	+	497
rusty	+	+	r	2,487
wildtype	+	+	+	308
TOTAL =				6,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. hmr Incorrect B. hm+ Incorrect C. h+r Incorrect D. h++ Correct E. +mr Correct F. +m+ Incorrect G. ++r Incorrect H. +++ Incorrect MA

cb86_7b01

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 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.
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
kidney, prickly, tipsy	k	p	t	489
kidney, prickly	k	p	+	5
kidney, tipsy	k	+	t	64
kidney	k	+	+	82
prickly, tipsy	+	p	t	80
prickly	+	p	+	62
tipsy	+	+	t	13
wildtype	+	+	+	405
TOTAL =				1,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. kpt Incorrect B. kp+ Correct C. k+t Incorrect D. k++ Incorrect E. +pt Incorrect F. +p+ Incorrect G. ++t Correct H. +++ Incorrect MA

8edf_b671

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 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 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
fuzzy, horsey, tipsy	f	h	t	47
fuzzy, horsey	f	h	+	140
fuzzy, tipsy	f	+	t	6
fuzzy	f	+	+	802
horsey, tipsy	+	h	t	788
horsey	+	h	+	4
tipsy	+	+	t	170
wildtype	+	+	+	43
TOTAL =				2,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. fht Incorrect B. fh+ Incorrect C. f+t Correct D. f++ Incorrect E. +ht Incorrect F. +h+ Correct G. ++t Incorrect H. +++ Incorrect MA

75ca_e173

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 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 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.
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
mushy, rusty, xanthic	m	r	x	552
mushy, rusty	m	r	+	1,020
mushy, xanthic	m	+	x	144
mushy	m	+	+	2,974
rusty, xanthic	+	r	x	2,948
rusty	+	r	+	138
xanthic	+	+	x	1,048
wildtype	+	+	+	576
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

A. mrx Incorrect B. mr+ Incorrect C. m+x Correct D. m++ Incorrect E. +rx Incorrect F. +r+ Correct G. ++x Incorrect H. +++ Incorrect MA

88f7_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 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 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 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
dewy, nerdy, prickly	d	n	p	27
dewy, nerdy	d	n	+	730
dewy, prickly	d	+	p	86
dewy	d	+	+	1,538
nerdy, prickly	+	n	p	1,534
nerdy	+	n	+	106
prickly	+	+	p	758
wildtype	+	+	+	21
TOTAL =				4,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the double crossover genotype combinations. These allele combinations are a result of two genetic crossover events.

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

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