d88a_0c94

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 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 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 K is related to the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
bumpy, dewy, kidney	b	d	k	2,586
bumpy, dewy	b	d	+	1,067
bumpy, kidney	b	+	k	129
bumpy	b	+	+	511
dewy, kidney	+	d	k	533
dewy	+	d	+	132
kidney	+	+	k	1,108
wildtype	+	+	+	2,634
TOTAL =				8,700

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes K and B. These genotypes result from crossover events that occur between the two genes K and B during meiosis.

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

A. bdk Incorrect B. bd+ Correct C. b+k Incorrect D. b++ Correct E. +dk Correct F. +d+ Incorrect G. ++k Correct H. +++ Incorrect MA

8b19_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 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 correlated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene P is 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
chummy, eery, prickly	c	e	p	385
chummy, eery	c	e	+	329
chummy, prickly	c	+	p	3,561
chummy	c	+	+	25
eery, prickly	+	e	p	18
eery	+	e	+	3,534
prickly	+	+	p	316
wildtype	+	+	+	432
TOTAL =				8,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes C and P. These genotypes result from crossover events that occur between the two genes C and P during meiosis.

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

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

a720_8aeb

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 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
kidney, nerdy, prickly	k	n	p	1,743
kidney, nerdy	k	n	+	814
kidney, prickly	k	+	p	210
kidney	k	+	+	43
nerdy, prickly	+	n	p	44
nerdy	+	n	+	225
prickly	+	+	p	839
wildtype	+	+	+	1,882
TOTAL =				5,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes K and N. These genotypes result from crossover events that occur between the two genes K and N during meiosis.

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

A. knp Incorrect B. kn+ Incorrect C. k+p Correct D. k++ Correct E. +np Correct F. +n+ Correct G. ++p Incorrect H. +++ Incorrect MA

cde2_9f0e

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 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 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
artsy, mushy, rusty	a	m	r	2,262
artsy, mushy	a	m	+	1,001
artsy, rusty	a	+	r	105
artsy	a	+	+	343
mushy, rusty	+	m	r	323
mushy	+	m	+	117
rusty	+	+	r	997
wildtype	+	+	+	2,252
TOTAL =				7,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes R and A. These genotypes result from crossover events that occur between the two genes R and A during meiosis.

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

A. amr Incorrect B. am+ Correct C. a+r Incorrect D. a++ Correct E. +mr Correct F. +m+ Incorrect G. ++r Correct H. +++ Incorrect MA

0192_2aff

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 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.
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 R is analogous to the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
fuzzy, horsey, rusty	f	h	r	91
fuzzy, horsey	f	h	+	1,216
fuzzy, rusty	f	+	r	219
fuzzy	f	+	+	599
horsey, rusty	+	h	r	598
horsey	+	h	+	222
rusty	+	+	r	1,157
wildtype	+	+	+	98
TOTAL =				4,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes F and H. These genotypes result from crossover events that occur between the two genes F and H during meiosis.

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

A. fhr Incorrect B. fh+ Incorrect C. f+r Correct D. f++ Correct E. +hr Correct F. +h+ Correct G. ++r Incorrect H. +++ Incorrect MA

6b20_7044

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 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 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.

Phenotype	Genotypes			Progeny Count
artsy, dewy, prickly	a	d	p	501
artsy, dewy	a	d	+	46
artsy, prickly	a	+	p	528
artsy	a	+	+	1,648
dewy, prickly	+	d	p	1,682
dewy	+	d	+	582
prickly	+	+	p	65
wildtype	+	+	+	498
TOTAL =				5,550

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes D and P. These genotypes result from crossover events that occur between the two genes D and P during meiosis.

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

A. adp Incorrect B. ad+ Correct C. a+p Correct D. a++ Incorrect E. +dp Incorrect F. +d+ Correct G. ++p Correct H. +++ Incorrect MA

18a2_6a64

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 correlated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene T is linked with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene Y is related to the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
rusty, tipsy, yucky	r	t	y	224
rusty, tipsy	r	t	+	10
rusty, yucky	r	+	y	556
rusty	r	+	+	84
tipsy, yucky	+	t	y	69
tipsy	+	t	+	605
yucky	+	+	y	17
wildtype	+	+	+	235
TOTAL =				1,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes T and R. These genotypes result from crossover events that occur between the two genes T and R during meiosis.

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

A. rty Correct B. rt+ Correct C. r+y Incorrect D. r++ Incorrect E. +ty Incorrect F. +t+ Incorrect G. ++y Correct H. +++ Correct MA

6047_4f1b

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 P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
artsy, horsey, prickly	a	h	p	61
artsy, horsey	a	h	+	2,176
artsy, prickly	a	+	p	1,227
artsy	a	+	+	125
horsey, prickly	+	h	p	127
horsey	+	h	+	1,257
prickly	+	+	p	2,180
wildtype	+	+	+	47
TOTAL =				7,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes H and P. These genotypes result from crossover events that occur between the two genes H and P during meiosis.

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

A. ahp Correct B. ah+ Incorrect C. a+p Incorrect D. a++ Correct E. +hp Correct F. +h+ Incorrect G. ++p Incorrect H. +++ Correct MA

04f7_3fd3

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene J is analogous to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene 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 W is related to the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
jerky, mushy, waxy	j	m	w	325
jerky, mushy	j	m	+	22
jerky, waxy	j	+	w	191
jerky	j	+	+	3,114
mushy, waxy	+	m	w	2,970
mushy	+	m	+	205
waxy	+	+	w	14
wildtype	+	+	+	359
TOTAL =				7,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes J and W. These genotypes result from crossover events that occur between the two genes J and W during meiosis.

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

A. jmw Correct B. jm+ Incorrect C. j+w Correct D. j++ Incorrect E. +mw Incorrect F. +m+ Correct G. ++w Incorrect H. +++ Correct MA

a021_e7fb

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene A is correlated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene B is related to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene P is analogous to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
artsy, bumpy, prickly	a	b	p	1,212
artsy, bumpy	a	b	+	254
artsy, prickly	a	+	p	36
artsy	a	+	+	425
bumpy, prickly	+	b	p	411
bumpy	+	b	+	40
prickly	+	+	p	240
wildtype	+	+	+	1,182
TOTAL =				3,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes A and B. These genotypes result from crossover events that occur between the two genes A and B during meiosis.

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

A. abp Incorrect B. ab+ Incorrect C. a+p Correct D. a++ Correct E. +bp Correct F. +b+ Correct G. ++p Incorrect H. +++ Incorrect MA

9760_8c93

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 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 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.

Phenotype	Genotypes			Progeny Count
chummy, fuzzy, nerdy	c	f	n	20
chummy, fuzzy	c	f	+	170
chummy, nerdy	c	+	n	1,279
chummy	c	+	+	221
fuzzy, nerdy	+	f	n	238
fuzzy	+	f	+	1,288
nerdy	+	+	n	153
wildtype	+	+	+	31
TOTAL =				3,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes F and N. These genotypes result from crossover events that occur between the two genes F and N during meiosis.

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

A. cfn Correct B. cf+ Incorrect C. c+n Incorrect D. c++ Correct E. +fn Correct F. +f+ Incorrect G. ++n Incorrect H. +++ Correct MA

1a26_3034

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene J is correlated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene K is 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 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.

Phenotype	Genotypes			Progeny Count
jerky, kidney, nerdy	j	k	n	8
jerky, kidney	j	k	+	80
jerky, nerdy	j	+	n	1,545
jerky	j	+	+	253
kidney, nerdy	+	k	n	298
kidney	+	k	+	1,514
nerdy	+	+	n	91
wildtype	+	+	+	11
TOTAL =				3,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes J and N. These genotypes result from crossover events that occur between the two genes J and N during meiosis.

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

A. jkn Incorrect B. jk+ Correct C. j+n Incorrect D. j++ Correct E. +kn Correct F. +k+ Incorrect G. ++n Correct H. +++ Incorrect MA

d519_5e5a

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 F is related to the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene K is linked with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
chummy, fuzzy, kidney	c	f	k	953
chummy, fuzzy	c	f	+	10
chummy, kidney	c	+	k	176
chummy	c	+	+	345
fuzzy, kidney	+	f	k	390
fuzzy	+	f	+	169
kidney	+	+	k	5
wildtype	+	+	+	952
TOTAL =				3,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes C and F. These genotypes result from crossover events that occur between the two genes C and F during meiosis.

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

A. cfk Incorrect B. cf+ Incorrect C. c+k Correct D. c++ Correct E. +fk Correct F. +f+ Correct G. ++k Incorrect H. +++ Incorrect MA

09c9_e972

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene A is related to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene N is 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 X is analogous to the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
artsy, nerdy, xanthic	a	n	x	42
artsy, nerdy	a	n	+	1,876
artsy, xanthic	a	+	x	294
artsy	a	+	+	684
nerdy, xanthic	+	n	x	679
nerdy	+	n	+	315
xanthic	+	+	x	1,865
wildtype	+	+	+	45
TOTAL =				5,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes X and A. These genotypes result from crossover events that occur between the two genes X and A during meiosis.

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

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

a634_4a9c

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene A is analogous to the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene C is correlated with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene 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
artsy, chummy, kidney	a	c	k	41
artsy, chummy	a	c	+	155
artsy, kidney	a	+	k	1,063
artsy	a	+	+	2,396
chummy, kidney	+	c	k	2,488
chummy	+	c	+	1,083
kidney	+	+	k	141
wildtype	+	+	+	33
TOTAL =				7,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes A and K. These genotypes result from crossover events that occur between the two genes A and K during meiosis.

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

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

e942_6d12

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 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 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
dewy, fuzzy, nerdy	d	f	n	11
dewy, fuzzy	d	f	+	335
dewy, nerdy	d	+	n	191
dewy	d	+	+	1,872
fuzzy, nerdy	+	f	n	1,848
fuzzy	+	f	+	169
nerdy	+	+	n	361
wildtype	+	+	+	13
TOTAL =				4,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes D and N. These genotypes result from crossover events that occur between the two genes D and N during meiosis.

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

A. dfn Correct B. df+ Incorrect C. d+n Correct D. d++ Incorrect E. +fn Incorrect F. +f+ Correct G. ++n Incorrect H. +++ Correct MA

364c_fec0

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene J is linked with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene 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 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
jerky, kidney, prickly	j	k	p	442
jerky, kidney	j	k	+	2,400
jerky, prickly	j	+	p	31
jerky	j	+	+	296
kidney, prickly	+	k	p	262
kidney	+	k	+	31
prickly	+	+	p	2,312
wildtype	+	+	+	426
TOTAL =				6,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes K and P. These genotypes result from crossover events that occur between the two genes K and P during meiosis.

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

A. jkp Correct B. jk+ Incorrect C. j+p Incorrect D. j++ Correct E. +kp Correct F. +k+ Incorrect G. ++p Incorrect H. +++ Correct MA

9bcf_acc8

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 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 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.

Phenotype	Genotypes			Progeny Count
bumpy, fuzzy, nerdy	b	f	n	29
bumpy, fuzzy	b	f	+	911
bumpy, nerdy	b	+	n	404
bumpy	b	+	+	109
fuzzy, nerdy	+	f	n	107
fuzzy	+	f	+	388
nerdy	+	+	n	889
wildtype	+	+	+	43
TOTAL =				2,880

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes B and N. These genotypes result from crossover events that occur between the two genes B and N during meiosis.

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

A. bfn Correct B. bf+ Incorrect C. b+n Correct D. b++ Incorrect E. +fn Incorrect F. +f+ Correct G. ++n Incorrect H. +++ Correct MA

ad65_5e72

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene P is 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 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 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
prickly, rusty, tipsy	p	r	t	1,357
prickly, rusty	p	r	+	405
prickly, tipsy	p	+	t	76
prickly	p	+	+	502
rusty, tipsy	+	r	t	554
rusty	+	r	+	68
tipsy	+	+	t	411
wildtype	+	+	+	1,427
TOTAL =				4,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes T and P. These genotypes result from crossover events that occur between the two genes T and P during meiosis.

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

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

250a_685c

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene B is associated with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene K is connected with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene R is 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, kidney, rusty	b	k	r	739
bumpy, kidney	b	k	+	64
bumpy, rusty	b	+	r	315
bumpy	b	+	+	2,083
kidney, rusty	+	k	r	2,142
kidney	+	k	+	335
rusty	+	+	r	66
wildtype	+	+	+	756
TOTAL =				6,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes R and B. These genotypes result from crossover events that occur between the two genes R and B during meiosis.

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

A. bkr Correct B. bk+ Incorrect C. b+r Correct D. b++ Incorrect E. +kr Incorrect F. +k+ Correct G. ++r Incorrect H. +++ Correct MA

22bc_674d

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is 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 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 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, jerky, yucky	d	j	y	636
dewy, jerky	d	j	+	264
dewy, yucky	d	+	y	102
dewy	d	+	+	1,499
jerky, yucky	+	j	y	1,510
jerky	+	j	+	102
yucky	+	+	y	297
wildtype	+	+	+	690
TOTAL =				5,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes Y and D. These genotypes result from crossover events that occur between the two genes Y and D during meiosis.

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

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

6b90_290f

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene A is correlated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene B is 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 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.

Phenotype	Genotypes			Progeny Count
artsy, bumpy, nerdy	a	b	n	366
artsy, bumpy	a	b	+	964
artsy, nerdy	a	+	n	55
artsy	a	+	+	295
bumpy, nerdy	+	b	n	300
bumpy	+	b	+	64
nerdy	+	+	n	991
wildtype	+	+	+	365
TOTAL =				3,400

The resulting phenotypes are summarized in the table above.

Question

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

A. abn Correct B. ab+ Incorrect C. a+n Incorrect D. a++ Correct E. +bn Correct F. +b+ Incorrect G. ++n Incorrect H. +++ Correct MA

29a8_ba95

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene B is associated with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene K is 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 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
bumpy, kidney, waxy	b	k	w	1,025
bumpy, kidney	b	k	+	2,393
bumpy, waxy	b	+	w	102
bumpy	b	+	+	282
kidney, waxy	+	k	w	288
kidney	+	k	+	88
waxy	+	+	w	2,357
wildtype	+	+	+	1,065
TOTAL =				7,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes K and W. These genotypes result from crossover events that occur between the two genes K and W during meiosis.

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

A. bkw Correct B. bk+ Incorrect C. b+w Incorrect D. b++ Correct E. +kw Correct F. +k+ Incorrect G. ++w Incorrect H. +++ Correct MA

54bd_beb0

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 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 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.

Phenotype	Genotypes			Progeny Count
artsy, dewy, nerdy	a	d	n	9
artsy, dewy	a	d	+	168
artsy, nerdy	a	+	n	348
artsy	a	+	+	1,304
dewy, nerdy	+	d	n	1,234
dewy	+	d	+	354
nerdy	+	+	n	174
wildtype	+	+	+	9
TOTAL =				3,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes N and A. These genotypes result from crossover events that occur between the two genes N and A during meiosis.

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

A. adn Correct B. ad+ Incorrect C. a+n Correct D. a++ Incorrect E. +dn Incorrect F. +d+ Correct G. ++n Incorrect H. +++ Correct MA

7aaa_4e4a

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene A is 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 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 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, chummy, tipsy	a	c	t	2,231
artsy, chummy	a	c	+	250
artsy, tipsy	a	+	t	44
artsy	a	+	+	781
chummy, tipsy	+	c	t	770
chummy	+	c	+	55
tipsy	+	+	t	245
wildtype	+	+	+	2,224
TOTAL =				6,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes C and T. These genotypes result from crossover events that occur between the two genes C and T during meiosis.

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

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

1270_4845

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 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 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
dewy, nerdy, xanthic	d	n	x	70
dewy, nerdy	d	n	+	1,849
dewy, xanthic	d	+	x	353
dewy	d	+	+	676
nerdy, xanthic	+	n	x	674
nerdy	+	n	+	337
xanthic	+	+	x	1,961
wildtype	+	+	+	80
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes X and D. These genotypes result from crossover events that occur between the two genes X and D during meiosis.

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

A. dnx Correct B. dn+ Incorrect C. d+x Correct D. d++ Incorrect E. +nx Incorrect F. +n+ Correct G. ++x Incorrect H. +++ Correct MA

5d79_abd1

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene E is affiliated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene 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 X is analogous to the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes			Progeny Count
eery, mushy, xanthic	e	m	x	84
eery, mushy	e	m	+	20
eery, xanthic	e	+	x	105
eery	e	+	+	292
mushy, xanthic	+	m	x	278
mushy	+	m	+	105
xanthic	+	+	x	20
wildtype	+	+	+	96
TOTAL =				1,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes M and X. These genotypes result from crossover events that occur between the two genes M and X during meiosis.

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

A. emx Incorrect B. em+ Correct C. e+x Correct D. e++ Incorrect E. +mx Incorrect F. +m+ Correct G. ++x Correct H. +++ Incorrect MA

9c3a_20a9

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 R is correlated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene 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
kidney, rusty, xanthic	k	r	x	813
kidney, rusty	k	r	+	2,028
kidney, xanthic	k	+	x	11
kidney	k	+	+	371
rusty, xanthic	+	r	x	365
rusty	+	r	+	21
xanthic	+	+	x	2,036
wildtype	+	+	+	755
TOTAL =				6,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes K and X. These genotypes result from crossover events that occur between the two genes K and X during meiosis.

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

A. krx Correct B. kr+ Incorrect C. k+x Correct D. k++ Incorrect E. +rx Incorrect F. +r+ Correct G. ++x Incorrect H. +++ Correct MA

b96c_15d8

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 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 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
dewy, horsey, yucky	d	h	y	833
dewy, horsey	d	h	+	937
dewy, yucky	d	+	y	2,766
dewy	d	+	+	231
horsey, yucky	+	h	y	249
horsey	+	h	+	2,802
yucky	+	+	y	983
wildtype	+	+	+	799
TOTAL =				9,600

The resulting phenotypes are summarized in the table above.

Question

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

A. dhy Incorrect B. dh+ Correct C. d+y Incorrect D. d++ Correct E. +hy Correct F. +h+ Incorrect G. ++y Correct H. +++ Incorrect MA

ce90_d402

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene B is 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 H is associated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene Y is 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, horsey, yucky	b	h	y	2,485
bumpy, horsey	b	h	+	160
bumpy, yucky	b	+	y	1,070
bumpy	b	+	+	472
horsey, yucky	+	h	y	441
horsey	+	h	+	1,088
yucky	+	+	y	172
wildtype	+	+	+	2,412
TOTAL =				8,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes Y and B. These genotypes result from crossover events that occur between the two genes Y and B during meiosis.

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

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

49ae_a822

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 related to the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene P is 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 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
eery, prickly, tipsy	e	p	t	1,408
eery, prickly	e	p	+	460
eery, tipsy	e	+	t	2,951
eery	e	+	+	53
prickly, tipsy	+	p	t	45
prickly	+	p	+	3,027
tipsy	+	+	t	422
wildtype	+	+	+	1,434
TOTAL =				9,800

The resulting phenotypes are summarized in the table above.

Question

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

A. ept Correct B. ep+ Incorrect C. e+t Incorrect D. e++ Correct E. +pt Correct F. +p+ Incorrect G. ++t Incorrect H. +++ Correct MA

1095_a046

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 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 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 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
rusty, tipsy, xanthic	r	t	x	1,136
rusty, tipsy	r	t	+	17
rusty, xanthic	r	+	x	556
rusty	r	+	+	71
tipsy, xanthic	+	t	x	69
tipsy	+	t	+	529
xanthic	+	+	x	18
wildtype	+	+	+	1,104
TOTAL =				3,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes R and X. These genotypes result from crossover events that occur between the two genes R and X during meiosis.

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

A. rtx Incorrect B. rt+ Correct C. r+x Incorrect D. r++ Correct E. +tx Correct F. +t+ Incorrect G. ++x Correct H. +++ Incorrect MA

d6d7_a0a2

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene B is related to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene N is 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 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
bumpy, nerdy, tipsy	b	n	t	1,025
bumpy, nerdy	b	n	+	143
bumpy, tipsy	b	+	t	31
bumpy	b	+	+	361
nerdy, tipsy	+	n	t	352
nerdy	+	n	+	31
tipsy	+	+	t	167
wildtype	+	+	+	990
TOTAL =				3,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes T and B. These genotypes result from crossover events that occur between the two genes T and B during meiosis.

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

A. bnt Incorrect B. bn+ Correct C. b+t Incorrect D. b++ Correct E. +nt Correct F. +n+ Incorrect G. ++t Correct H. +++ Incorrect MA

90a1_7a5c

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 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 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, eery, yucky	c	e	y	244
chummy, eery	c	e	+	1,428
chummy, yucky	c	+	y	9
chummy	c	+	+	54
eery, yucky	+	e	y	65
eery	+	e	+	8
yucky	+	+	y	1,343
wildtype	+	+	+	249
TOTAL =				3,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes Y and C. These genotypes result from crossover events that occur between the two genes Y and C during meiosis.

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

A. cey Correct B. ce+ Incorrect C. c+y Correct D. c++ Incorrect E. +ey Incorrect F. +e+ Correct G. ++y Incorrect H. +++ Correct MA

d956_b25b

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene J is correlated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene 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
jerky, nerdy, tipsy	j	n	t	63
jerky, nerdy	j	n	+	6
jerky, tipsy	j	+	t	421
jerky	j	+	+	205
nerdy, tipsy	+	n	t	208
nerdy	+	n	+	426
tipsy	+	+	t	1
wildtype	+	+	+	70
TOTAL =				1,400

The resulting phenotypes are summarized in the table above.

Question

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

A. jnt Correct B. jn+ Correct C. j+t Incorrect D. j++ Incorrect E. +nt Incorrect F. +n+ Incorrect G. ++t Correct H. +++ Correct MA

e4e7_4336

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 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 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, mushy, tipsy	c	m	t	67
chummy, mushy	c	m	+	397
chummy, tipsy	c	+	t	895
chummy	c	+	+	240
mushy, tipsy	+	m	t	192
mushy	+	m	+	913
tipsy	+	+	t	419
wildtype	+	+	+	77
TOTAL =				3,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes T and M. These genotypes result from crossover events that occur between the two genes T and M during meiosis.

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

A. cmt Correct B. cm+ Incorrect C. c+t Incorrect D. c++ Correct E. +mt Correct F. +m+ Incorrect G. ++t Incorrect H. +++ Correct MA

4f8a_a822

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene E is affiliated with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene 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 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
eery, prickly, tipsy	e	p	t	159
eery, prickly	e	p	+	1,167
eery, tipsy	e	+	t	16
eery	e	+	+	1,996
prickly, tipsy	+	p	t	2,118
prickly	+	p	+	18
tipsy	+	+	t	1,179
wildtype	+	+	+	147
TOTAL =				6,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes E and T. These genotypes result from crossover events that occur between the two genes E and T during meiosis.

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

A. ept Correct B. ep+ Incorrect C. e+t Correct D. e++ Incorrect E. +pt Incorrect F. +p+ Correct G. ++t Incorrect H. +++ Correct MA

2fd6_f2ed

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is affiliated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene N is 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 T is associated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
horsey, nerdy, tipsy	h	n	t	2,505
horsey, nerdy	h	n	+	850
horsey, tipsy	h	+	t	82
horsey	h	+	+	727
nerdy, tipsy	+	n	t	785
nerdy	+	n	+	86
tipsy	+	+	t	830
wildtype	+	+	+	2,535
TOTAL =				8,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes T and N. These genotypes result from crossover events that occur between the two genes T and N during meiosis.

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

A. hnt Incorrect B. hn+ Correct C. h+t Correct D. h++ Incorrect E. +nt Incorrect F. +n+ Correct G. ++t Correct H. +++ Incorrect MA

5eec_d8a4

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene A is affiliated 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 correlated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene P is 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
artsy, nerdy, prickly	a	n	p	184
artsy, nerdy	a	n	+	716
artsy, prickly	a	+	p	933
artsy	a	+	+	2,570
nerdy, prickly	+	n	p	2,622
nerdy	+	n	+	915
prickly	+	+	p	692
wildtype	+	+	+	168
TOTAL =				8,800

The resulting phenotypes are summarized in the table above.

Question

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

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

1045_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 correlated with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene 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 R is analogous to the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
chummy, jerky, rusty	c	j	r	290
chummy, jerky	c	j	+	104
chummy, rusty	c	+	r	69
chummy	c	+	+	11
jerky, rusty	+	j	r	14
jerky	+	j	+	86
rusty	+	+	r	121
wildtype	+	+	+	305
TOTAL =				1,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes J and R. These genotypes result from crossover events that occur between the two genes J and R during meiosis.

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

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

e523_2819

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene C is linked with the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene D is connected with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene T is 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, dewy, tipsy	c	d	t	297
chummy, dewy	c	d	+	16
chummy, tipsy	c	+	t	32
chummy	c	+	+	161
dewy, tipsy	+	d	t	159
dewy	+	d	+	38
tipsy	+	+	t	14
wildtype	+	+	+	283
TOTAL =				1,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes D and T. These genotypes result from crossover events that occur between the two genes D and T during meiosis.

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

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

7bd9_2f3f

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is 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 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 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
dewy, nerdy, waxy	d	n	w	97
dewy, nerdy	d	n	+	619
dewy, waxy	d	+	w	3,001
dewy	d	+	+	827
nerdy, waxy	+	n	w	802
nerdy	+	n	+	2,972
waxy	+	+	w	648
wildtype	+	+	+	84
TOTAL =				9,050

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes N and D. These genotypes result from crossover events that occur between the two genes N and D during meiosis.

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

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

8f0d_ac46

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 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.
Gene M is correlated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene W is 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
fuzzy, mushy, waxy	f	m	w	836
fuzzy, mushy	f	m	+	381
fuzzy, waxy	f	+	w	2,310
fuzzy	f	+	+	17
mushy, waxy	+	m	w	18
mushy	+	m	+	2,205
waxy	+	+	w	354
wildtype	+	+	+	879
TOTAL =				7,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes F and M. These genotypes result from crossover events that occur between the two genes F and M during meiosis.

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

A. fmw Correct B. fm+ Correct C. f+w Incorrect D. f++ Incorrect E. +mw Incorrect F. +m+ Incorrect G. ++w Correct H. +++ Correct MA

1d1a_43bd

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene B is 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 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 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
bumpy, nerdy, yucky	b	n	y	878
bumpy, nerdy	b	n	+	71
bumpy, yucky	b	+	y	2,263
bumpy	b	+	+	535
nerdy, yucky	+	n	y	529
nerdy	+	n	+	2,373
yucky	+	+	y	81
wildtype	+	+	+	870
TOTAL =				7,600

The resulting phenotypes are summarized in the table above.

Question

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

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

0475_d1c7

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 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 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.

Phenotype	Genotypes			Progeny Count
eery, fuzzy, horsey	e	f	h	357
eery, fuzzy	e	f	+	856
eery, horsey	e	+	h	67
eery	e	+	+	3,447
fuzzy, horsey	+	f	h	3,368
fuzzy	+	f	+	74
horsey	+	+	h	883
wildtype	+	+	+	348
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes H and F. These genotypes result from crossover events that occur between the two genes H and F during meiosis.

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

A. efh Incorrect B. ef+ Correct C. e+h Correct D. e++ Incorrect E. +fh Incorrect F. +f+ Correct G. ++h Correct H. +++ Incorrect MA

2267_1c35

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 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 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
dewy, kidney, xanthic	d	k	x	28
dewy, kidney	d	k	+	597
dewy, xanthic	d	+	x	2,236
dewy	d	+	+	116
kidney, xanthic	+	k	x	124
kidney	+	k	+	2,204
xanthic	+	+	x	663
wildtype	+	+	+	32
TOTAL =				6,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes D and K. These genotypes result from crossover events that occur between the two genes D and K during meiosis.

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

A. dkx Correct B. dk+ Correct C. d+x Incorrect D. d++ Incorrect E. +kx Incorrect F. +k+ Incorrect G. ++x Correct H. +++ Correct MA

dc22_63e6

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 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 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, nerdy, yucky	c	n	y	764
chummy, nerdy	c	n	+	1,922
chummy, yucky	c	+	y	510
chummy	c	+	+	67
nerdy, yucky	+	n	y	61
nerdy	+	n	+	514
yucky	+	+	y	1,854
wildtype	+	+	+	708
TOTAL =				6,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes Y and N. These genotypes result from crossover events that occur between the two genes Y and N during meiosis.

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

A. cny Correct B. cn+ Incorrect C. c+y Incorrect D. c++ Correct E. +ny Correct F. +n+ Incorrect G. ++y Incorrect H. +++ Correct MA

452c_233f

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 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.
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
prickly, waxy, xanthic	p	w	x	43
prickly, waxy	p	w	+	5
prickly, xanthic	p	+	x	777
prickly	p	+	+	144
waxy, xanthic	+	w	x	146
waxy	+	w	+	833
xanthic	+	+	x	5
wildtype	+	+	+	47
TOTAL =				2,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes X and W. These genotypes result from crossover events that occur between the two genes X and W during meiosis.

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

A. pwx Correct B. pw+ Incorrect C. p+x Incorrect D. p++ Correct E. +wx Correct F. +w+ Incorrect G. ++x Incorrect H. +++ Correct MA

b60a_6d55

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 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.
Gene K is related to the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene 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
fuzzy, kidney, prickly	f	k	p	20
fuzzy, kidney	f	k	+	1
fuzzy, prickly	f	+	p	273
fuzzy	f	+	+	615
kidney, prickly	+	k	p	600
kidney	+	k	+	258
prickly	+	+	p	8
wildtype	+	+	+	25
TOTAL =				1,800

The resulting phenotypes are summarized in the table above.

Question

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

A. fkp Incorrect B. fk+ Correct C. f+p Correct D. f++ Incorrect E. +kp Incorrect F. +k+ Correct G. ++p Correct H. +++ Incorrect MA

40f8_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 connected with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene N is 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.

Phenotype	Genotypes			Progeny Count
chummy, mushy, nerdy	c	m	n	75
chummy, mushy	c	m	+	3
chummy, nerdy	c	+	n	404
chummy	c	+	+	23
mushy, nerdy	+	m	n	32
mushy	+	m	+	391
nerdy	+	+	n	2
wildtype	+	+	+	70
TOTAL =				1,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes M and N. These genotypes result from crossover events that occur between the two genes M and N during meiosis.

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

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

7f12_685c

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 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 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
bumpy, kidney, rusty	b	k	r	1,242
bumpy, kidney	b	k	+	119
bumpy, rusty	b	+	r	271
bumpy	b	+	+	2,262
kidney, rusty	+	k	r	2,204
kidney	+	k	+	268
rusty	+	+	r	112
wildtype	+	+	+	1,222
TOTAL =				7,700

The resulting phenotypes are summarized in the table above.

Question

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

A. bkr Correct B. bk+ Incorrect C. b+r Correct D. b++ Incorrect E. +kr Incorrect F. +k+ Correct G. ++r Incorrect H. +++ Correct MA

9de5_ba5a

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 R is affiliated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene T is 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
fuzzy, rusty, tipsy	f	r	t	140
fuzzy, rusty	f	r	+	2,840
fuzzy, tipsy	f	+	t	1,447
fuzzy	f	+	+	334
rusty, tipsy	+	r	t	338
rusty	+	r	+	1,433
tipsy	+	+	t	2,920
wildtype	+	+	+	148
TOTAL =				9,600

The resulting phenotypes are summarized in the table above.

Question

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

A. frt Correct B. fr+ Incorrect C. f+t Incorrect D. f++ Correct E. +rt Correct F. +r+ Incorrect G. ++t Incorrect H. +++ Correct MA

4779_d4ce

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 connected with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene J is 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
artsy, fuzzy, jerky	a	f	j	706
artsy, fuzzy	a	f	+	88
artsy, jerky	a	+	j	625
artsy	a	+	+	2,140
fuzzy, jerky	+	f	j	2,120
fuzzy	+	f	+	653
jerky	+	+	j	54
wildtype	+	+	+	714
TOTAL =				7,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes F and A. These genotypes result from crossover events that occur between the two genes F and A during meiosis.

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

A. afj Correct B. af+ Correct C. a+j Incorrect D. a++ Incorrect E. +fj Incorrect F. +f+ Incorrect G. ++j Correct H. +++ Correct MA

32ec_8aa3

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene F is connected with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene 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 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, jerky, waxy	f	j	w	508
fuzzy, jerky	f	j	+	121
fuzzy, waxy	f	+	w	687
fuzzy	f	+	+	2,143
jerky, waxy	+	j	w	2,127
jerky	+	j	+	783
waxy	+	+	w	159
wildtype	+	+	+	472
TOTAL =				7,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes F and J. These genotypes result from crossover events that occur between the two genes F and J during meiosis.

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

A. fjw Correct B. fj+ Correct C. f+w Incorrect D. f++ Incorrect E. +jw Incorrect F. +j+ Incorrect G. ++w Correct H. +++ Correct MA

d498_14f7

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is related to the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene P is 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
dewy, prickly, rusty	d	p	r	80
dewy, prickly	d	p	+	26
dewy, rusty	d	+	r	753
dewy	d	+	+	309
prickly, rusty	+	p	r	349
prickly	+	p	+	751
rusty	+	+	r	21
wildtype	+	+	+	61
TOTAL =				2,350

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes P and R. These genotypes result from crossover events that occur between the two genes P and R during meiosis.

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

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

f3dd_8609

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 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 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 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
mushy, rusty, waxy	m	r	w	791
mushy, rusty	m	r	+	244
mushy, waxy	m	+	w	54
mushy	m	+	+	288
rusty, waxy	+	r	w	300
rusty	+	r	+	58
waxy	+	+	w	260
wildtype	+	+	+	805
TOTAL =				2,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes W and R. These genotypes result from crossover events that occur between the two genes W and R during meiosis.

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

A. mrw Incorrect B. mr+ Correct C. m+w Correct D. m++ Incorrect E. +rw Incorrect F. +r+ Correct G. ++w Correct H. +++ Incorrect MA

5c96_8bc8

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 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 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
chummy, horsey, rusty	c	h	r	270
chummy, horsey	c	h	+	44
chummy, rusty	c	+	r	2,369
chummy	c	+	+	657
horsey, rusty	+	h	r	601
horsey	+	h	+	2,493
rusty	+	+	r	58
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 all recombinant genotypes for genes H and C. These genotypes result from crossover events that occur between the two genes H and C during meiosis.

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

A. chr Correct B. ch+ Correct C. c+r Incorrect D. c++ Incorrect E. +hr Incorrect F. +h+ Incorrect G. ++r Correct H. +++ Correct MA

edca_41a8

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is 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 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 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, mushy, yucky	d	m	y	1,871
dewy, mushy	d	m	+	39
dewy, yucky	d	+	y	1,021
dewy	d	+	+	106
mushy, yucky	+	m	y	77
mushy	+	m	+	1,053
yucky	+	+	y	22
wildtype	+	+	+	1,911
TOTAL =				6,100

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes M and Y. These genotypes result from crossover events that occur between the two genes M and Y during meiosis.

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

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

3a9d_9f0b

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes			Progeny Count
dewy, eery, fuzzy	d	e	f	169
dewy, eery	d	e	+	1,677
dewy, fuzzy	d	+	f	435
dewy	d	+	+	29
eery, fuzzy	+	e	f	40
eery	+	e	+	416
fuzzy	+	+	f	1,658
wildtype	+	+	+	176
TOTAL =				4,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes E and F. These genotypes result from crossover events that occur between the two genes E and F during meiosis.

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

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

1bf3_34ac

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene E is 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 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 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, prickly, rusty	e	p	r	123
eery, prickly	e	p	+	305
eery, rusty	e	+	r	6
eery	e	+	+	30
prickly, rusty	+	p	r	27
prickly	+	p	+	13
rusty	+	+	r	303
wildtype	+	+	+	143
TOTAL =				950

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes E and P. These genotypes result from crossover events that occur between the two genes E and P during meiosis.

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

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

0f6b_f30b

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 connected with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene P is analogous to the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
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
nerdy, prickly, xanthic	n	p	x	443
nerdy, prickly	n	p	+	166
nerdy, xanthic	n	+	x	7
nerdy	n	+	+	63
prickly, xanthic	+	p	x	67
prickly	+	p	+	19
xanthic	+	+	x	133
wildtype	+	+	+	402
TOTAL =				1,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes X and N. These genotypes result from crossover events that occur between the two genes X and N during meiosis.

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

A. npx Incorrect B. np+ Correct C. n+x Incorrect D. n++ Correct E. +px Correct F. +p+ Incorrect G. ++x Correct H. +++ Incorrect MA

3c67_4807

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene C is 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 connected with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene R is 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
chummy, kidney, rusty	c	k	r	92
chummy, kidney	c	k	+	576
chummy, rusty	c	+	r	447
chummy	c	+	+	1,509
kidney, rusty	+	k	r	1,481
kidney	+	k	+	463
rusty	+	+	r	542
wildtype	+	+	+	90
TOTAL =				5,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes K and C. These genotypes result from crossover events that occur between the two genes K and C during meiosis.

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

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

68d6_08f3

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 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.
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 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
fuzzy, nerdy, xanthic	f	n	x	45
fuzzy, nerdy	f	n	+	379
fuzzy, xanthic	f	+	x	1,487
fuzzy	f	+	+	221
nerdy, xanthic	+	n	x	209
nerdy	+	n	+	1,523
xanthic	+	+	x	395
wildtype	+	+	+	41
TOTAL =				4,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes X and F. These genotypes result from crossover events that occur between the two genes X and F during meiosis.

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

A. fnx Incorrect B. fn+ Correct C. f+x Incorrect D. f++ Correct E. +nx Correct F. +n+ Incorrect G. ++x Correct H. +++ Incorrect MA

5c40_2e29

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 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 M is related to the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.

Phenotype	Genotypes			Progeny Count
fuzzy, horsey, mushy	f	h	m	28
fuzzy, horsey	f	h	+	8
fuzzy, mushy	f	+	m	865
fuzzy	f	+	+	378
horsey, mushy	+	h	m	389
horsey	+	h	+	890
mushy	+	+	m	5
wildtype	+	+	+	37
TOTAL =				2,600

The resulting phenotypes are summarized in the table above.

Question

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

A. fhm Correct B. fh+ Correct C. f+m Incorrect D. f++ Incorrect E. +hm Incorrect F. +h+ Incorrect G. ++m Correct H. +++ Correct MA

458e_2355

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 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 correlated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.

Phenotype	Genotypes			Progeny Count
dewy, fuzzy, mushy	d	f	m	606
dewy, fuzzy	d	f	+	1,133
dewy, mushy	d	+	m	22
dewy	d	+	+	2,923
fuzzy, mushy	+	f	m	2,858
fuzzy	+	f	+	25
mushy	+	+	m	1,170
wildtype	+	+	+	663
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes D and F. These genotypes result from crossover events that occur between the two genes D and F during meiosis.

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

A. dfm Correct B. df+ Correct C. d+m Incorrect D. d++ Incorrect E. +fm Incorrect F. +f+ Incorrect G. ++m Correct H. +++ Correct MA

ccd9_c84e

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes			Progeny Count
mushy, rusty, tipsy	m	r	t	1,715
mushy, rusty	m	r	+	544
mushy, tipsy	m	+	t	9
mushy	m	+	+	53
rusty, tipsy	+	r	t	62
rusty	+	r	+	14
tipsy	+	+	t	583
wildtype	+	+	+	1,620
TOTAL =				4,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes M and T. These genotypes result from crossover events that occur between the two genes M and T during meiosis.

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

A. mrt Incorrect B. mr+ Correct C. m+t Incorrect D. m++ Correct E. +rt Correct F. +r+ Incorrect G. ++t Correct H. +++ Incorrect MA

4da2_3d8e

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 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 P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes			Progeny Count
artsy, jerky, prickly	a	j	p	809
artsy, jerky	a	j	+	19
artsy, prickly	a	+	p	241
artsy	a	+	+	2,262
jerky, prickly	+	j	p	2,193
jerky	+	j	+	254
prickly	+	+	p	14
wildtype	+	+	+	808
TOTAL =				6,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes P and J. These genotypes result from crossover events that occur between the two genes P and J during meiosis.

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

A. ajp Incorrect B. aj+ Correct C. a+p Correct D. a++ Incorrect E. +jp Incorrect F. +j+ Correct G. ++p Correct H. +++ Incorrect MA

d446_eb5d

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 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
bumpy, dewy, yucky	b	d	y	569
bumpy, dewy	b	d	+	219
bumpy, yucky	b	+	y	76
bumpy	b	+	+	1,313
dewy, yucky	+	d	y	1,305
dewy	+	d	+	78
yucky	+	+	y	243
wildtype	+	+	+	597
TOTAL =				4,400

The resulting phenotypes are summarized in the table above.

Question

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

A. bdy Incorrect B. bd+ Correct C. b+y Correct D. b++ Incorrect E. +dy Incorrect F. +d+ Correct G. ++y Correct H. +++ Incorrect MA

f4fb_9904

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 H is correlated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene 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
artsy, horsey, jerky	a	h	j	73
artsy, horsey	a	h	+	587
artsy, jerky	a	+	j	228
artsy	a	+	+	1,801
horsey, jerky	+	h	j	1,790
horsey	+	h	+	231
jerky	+	+	j	628
wildtype	+	+	+	62
TOTAL =				5,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes A and H. These genotypes result from crossover events that occur between the two genes A and H during meiosis.

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

A. ahj Correct B. ah+ Correct C. a+j Incorrect D. a++ Incorrect E. +hj Incorrect F. +h+ Incorrect G. ++j Correct H. +++ Correct MA

663b_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 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 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 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
bumpy, jerky, nerdy	b	j	n	2,693
bumpy, jerky	b	j	+	692
bumpy, nerdy	b	+	n	943
bumpy	b	+	+	202
jerky, nerdy	+	j	n	203
jerky	+	j	+	902
nerdy	+	+	n	703
wildtype	+	+	+	2,662
TOTAL =				9,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes N and B. These genotypes result from crossover events that occur between the two genes N and B during meiosis.

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

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

b963_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 linked 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 associated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
artsy, nerdy, tipsy	a	n	t	52
artsy, nerdy	a	n	+	3
artsy, tipsy	a	+	t	671
artsy	a	+	+	371
nerdy, tipsy	+	n	t	388
nerdy	+	n	+	660
tipsy	+	+	t	8
wildtype	+	+	+	47
TOTAL =				2,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes A and T. These genotypes result from crossover events that occur between the two genes A and T during meiosis.

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

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

2349_e6e4

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 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.
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
nerdy, rusty, waxy	n	r	w	3,570
nerdy, rusty	n	r	+	27
nerdy, waxy	n	+	w	223
nerdy	n	+	+	901
rusty, waxy	+	r	w	932
rusty	+	r	+	200
waxy	+	+	w	20
wildtype	+	+	+	3,527
TOTAL =				9,400

The resulting phenotypes are summarized in the table above.

Question

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

A. nrw Incorrect B. nr+ Correct C. n+w Correct D. n++ Incorrect E. +rw Incorrect F. +r+ Correct G. ++w Correct H. +++ Incorrect MA

5e24_b993

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 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 affiliated with the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes			Progeny Count
chummy, fuzzy, yucky	c	f	y	11
chummy, fuzzy	c	f	+	180
chummy, yucky	c	+	y	95
chummy	c	+	+	481
fuzzy, yucky	+	f	y	449
fuzzy	+	f	+	100
yucky	+	+	y	180
wildtype	+	+	+	4
TOTAL =				1,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes C and Y. These genotypes result from crossover events that occur between the two genes C and Y during meiosis.

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

A. cfy Correct B. cf+ Incorrect C. c+y Correct D. c++ Incorrect E. +fy Incorrect F. +f+ Correct G. ++y Incorrect H. +++ Correct MA

b07d_233f

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 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.
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
prickly, waxy, xanthic	p	w	x	1,695
prickly, waxy	p	w	+	472
prickly, xanthic	p	+	x	179
prickly	p	+	+	40
waxy, xanthic	+	w	x	29
waxy	+	w	+	212
xanthic	+	+	x	425
wildtype	+	+	+	1,548
TOTAL =				4,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes W and P. These genotypes result from crossover events that occur between the two genes W and P during meiosis.

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

A. pwx Incorrect B. pw+ Incorrect C. p+x Correct D. p++ Correct E. +wx Correct F. +w+ Correct G. ++x Incorrect H. +++ Incorrect MA

7ae0_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 affiliated with the 'artsy' phenotype. A fruit fly that is homozygous recessive for Gene A has wings that are colorful and distinctive patterns.
Gene B is analogous to the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene 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	485
artsy, bumpy	a	b	+	553
artsy, fuzzy	a	+	f	1,519
artsy	a	+	+	126
bumpy, fuzzy	+	b	f	139
bumpy	+	b	+	1,555
fuzzy	+	+	f	507
wildtype	+	+	+	416
TOTAL =				5,300

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes B and F. These genotypes result from crossover events that occur between the two genes B and F during meiosis.

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

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

6bdd_d906

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 J is linked with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene 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
bumpy, jerky, rusty	b	j	r	225
bumpy, jerky	b	j	+	260
bumpy, rusty	b	+	r	18
bumpy	b	+	+	1,553
jerky, rusty	+	j	r	1,555
jerky	+	j	+	24
rusty	+	+	r	328
wildtype	+	+	+	237
TOTAL =				4,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes J and B. These genotypes result from crossover events that occur between the two genes J and B during meiosis.

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

A. bjr Correct B. bj+ Correct C. b+r Incorrect D. b++ Incorrect E. +jr Incorrect F. +j+ Incorrect G. ++r Correct H. +++ Correct MA

2371_4a12

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 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 R is analogous to the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
eery, horsey, rusty	e	h	r	217
eery, horsey	e	h	+	6
eery, rusty	e	+	r	839
eery	e	+	+	42
horsey, rusty	+	h	r	35
horsey	+	h	+	844
rusty	+	+	r	5
wildtype	+	+	+	212
TOTAL =				2,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes E and H. These genotypes result from crossover events that occur between the two genes E and H during meiosis.

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

A. ehr Correct B. eh+ Correct C. e+r Incorrect D. e++ Incorrect E. +hr Incorrect F. +h+ Incorrect G. ++r Correct H. +++ Correct MA

903d_9f0e

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 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 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, mushy, rusty	a	m	r	2,232
artsy, mushy	a	m	+	1,237
artsy, rusty	a	+	r	51
artsy	a	+	+	158
mushy, rusty	+	m	r	175
mushy	+	m	+	60
rusty	+	+	r	1,242
wildtype	+	+	+	2,245
TOTAL =				7,400

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes A and M. These genotypes result from crossover events that occur between the two genes A and M during meiosis.

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

A. amr Incorrect B. am+ Incorrect C. a+r Correct D. a++ Correct E. +mr Correct F. +m+ Correct G. ++r Incorrect H. +++ Incorrect MA

adaf_18dc

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is 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 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 R is affiliated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes			Progeny Count
dewy, jerky, rusty	d	j	r	22
dewy, jerky	d	j	+	383
dewy, rusty	d	+	r	1,110
dewy	d	+	+	71
jerky, rusty	+	j	r	105
jerky	+	j	+	1,114
rusty	+	+	r	369
wildtype	+	+	+	26
TOTAL =				3,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes D and J. These genotypes result from crossover events that occur between the two genes D and J during meiosis.

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

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

0a31_f38a

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 R is affiliated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene 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
eery, rusty, xanthic	e	r	x	886
eery, rusty	e	r	+	2,626
eery, xanthic	e	+	x	756
eery	e	+	+	227
rusty, xanthic	+	r	x	223
rusty	+	r	+	774
xanthic	+	+	x	2,594
wildtype	+	+	+	914
TOTAL =				9,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes E and R. These genotypes result from crossover events that occur between the two genes E and R during meiosis.

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

A. erx Incorrect B. er+ Incorrect C. e+x Correct D. e++ Correct E. +rx Correct F. +r+ Correct G. ++x Incorrect H. +++ Incorrect MA

6761_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 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 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 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
dewy, xanthic, yucky	d	x	y	565
dewy, xanthic	d	x	+	1,453
dewy, yucky	d	+	y	57
dewy	d	+	+	327
xanthic, yucky	+	x	y	321
xanthic	+	x	+	63
yucky	+	+	y	1,499
wildtype	+	+	+	515
TOTAL =				4,800

The resulting phenotypes are summarized in the table above.

Question

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

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

62a2_e62b

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 affiliated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene K is linked with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene T is affiliated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes			Progeny Count
jerky, kidney, tipsy	j	k	t	285
jerky, kidney	j	k	+	51
jerky, tipsy	j	+	t	1,414
jerky	j	+	+	535
kidney, tipsy	+	k	t	500
kidney	+	k	+	1,421
tipsy	+	+	t	39
wildtype	+	+	+	255
TOTAL =				4,500

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes J and T. These genotypes result from crossover events that occur between the two genes J and T during meiosis.

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

A. jkt Incorrect B. jk+ Correct C. j+t Incorrect D. j++ Correct E. +kt Correct F. +k+ Incorrect G. ++t Correct H. +++ Incorrect MA

230b_6788

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 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 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
jerky, rusty, waxy	j	r	w	229
jerky, rusty	j	r	+	1,106
jerky, waxy	j	+	w	38
jerky	j	+	+	284
rusty, waxy	+	r	w	301
rusty	+	r	+	27
waxy	+	+	w	1,039
wildtype	+	+	+	226
TOTAL =				3,250

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes W and J. These genotypes result from crossover events that occur between the two genes W and J during meiosis.

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

A. jrw Correct B. jr+ Incorrect C. j+w Correct D. j++ Incorrect E. +rw Incorrect F. +r+ Correct G. ++w Incorrect H. +++ Correct MA

62b7_5e5a

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 F is correlated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene K is connected with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes			Progeny Count
chummy, fuzzy, kidney	c	f	k	135
chummy, fuzzy	c	f	+	1,577
chummy, kidney	c	+	k	567
chummy	c	+	+	497
fuzzy, kidney	+	f	k	483
fuzzy	+	f	+	581
kidney	+	+	k	1,643
wildtype	+	+	+	117
TOTAL =				5,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes K and F. These genotypes result from crossover events that occur between the two genes K and F during meiosis.

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

A. cfk Correct B. cf+ Incorrect C. c+k Incorrect D. c++ Correct E. +fk Correct F. +f+ Incorrect G. ++k Incorrect H. +++ Correct MA

01a4_cad0

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene J is analogous to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene 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 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
jerky, rusty, yucky	j	r	y	193
jerky, rusty	j	r	+	340
jerky, yucky	j	+	y	985
jerky	j	+	+	57
rusty, yucky	+	r	y	55
rusty	+	r	+	1,015
yucky	+	+	y	348
wildtype	+	+	+	207
TOTAL =				3,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes J and Y. These genotypes result from crossover events that occur between the two genes J and Y during meiosis.

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

A. jry Incorrect B. jr+ Correct C. j+y Incorrect D. j++ Correct E. +ry Correct F. +r+ Incorrect G. ++y Correct H. +++ Incorrect MA

8ae8_6620

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 W is affiliated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.
Gene X is 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
chummy, waxy, xanthic	c	w	x	18
chummy, waxy	c	w	+	476
chummy, xanthic	c	+	x	1,835
chummy	c	+	+	148
waxy, xanthic	+	w	x	152
waxy	+	w	+	1,865
xanthic	+	+	x	474
wildtype	+	+	+	32
TOTAL =				5,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes C and W. These genotypes result from crossover events that occur between the two genes C and W during meiosis.

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

A. cwx Correct B. cw+ Correct C. c+x Incorrect D. c++ Incorrect E. +wx Incorrect F. +w+ Incorrect G. ++x Correct H. +++ Correct MA

0155_08f3

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 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 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
fuzzy, nerdy, xanthic	f	n	x	107
fuzzy, nerdy	f	n	+	33
fuzzy, xanthic	f	+	x	368
fuzzy	f	+	+	785
nerdy, xanthic	+	n	x	815
nerdy	+	n	+	336
xanthic	+	+	x	31
wildtype	+	+	+	85
TOTAL =				2,560

The resulting phenotypes are summarized in the table above.

Question

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

A. fnx Correct B. fn+ Incorrect C. f+x Correct D. f++ Incorrect E. +nx Incorrect F. +n+ Correct G. ++x Incorrect H. +++ Correct MA

60d5_dbd0

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is linked with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene 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 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
horsey, nerdy, xanthic	h	n	x	711
horsey, nerdy	h	n	+	197
horsey, xanthic	h	+	x	1,078
horsey	h	+	+	2,672
nerdy, xanthic	+	n	x	2,618
nerdy	+	n	+	992
xanthic	+	+	x	217
wildtype	+	+	+	715
TOTAL =				9,200

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes H and X. These genotypes result from crossover events that occur between the two genes H and X during meiosis.

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

A. hnx Correct B. hn+ Incorrect C. h+x Correct D. h++ Incorrect E. +nx Incorrect F. +n+ Correct G. ++x Incorrect H. +++ Correct MA

8858_a8a3

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene N is related to the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene 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 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
nerdy, rusty, tipsy	n	r	t	13
nerdy, rusty	n	r	+	196
nerdy, tipsy	n	+	t	91
nerdy	n	+	+	1,589
rusty, tipsy	+	r	t	1,622
rusty	+	r	+	80
tipsy	+	+	t	203
wildtype	+	+	+	6
TOTAL =				3,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes R and N. These genotypes result from crossover events that occur between the two genes R and N during meiosis.

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

A. nrt Correct B. nr+ Correct C. n+t Incorrect D. n++ Incorrect E. +rt Incorrect F. +r+ Incorrect G. ++t Correct H. +++ Correct MA

f9db_b880

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes			Progeny Count
dewy, horsey, waxy	d	h	w	978
dewy, horsey	d	h	+	53
dewy, waxy	d	+	w	1,801
dewy	d	+	+	98
horsey, waxy	+	h	w	105
horsey	+	h	+	1,766
waxy	+	+	w	34
wildtype	+	+	+	965
TOTAL =				5,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes H and D. These genotypes result from crossover events that occur between the two genes H and D during meiosis.

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

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

da60_cad0

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene J is analogous to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene R is associated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene Y is 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
jerky, rusty, yucky	j	r	y	852
jerky, rusty	j	r	+	2,385
jerky, yucky	j	+	y	109
jerky	j	+	+	609
rusty, yucky	+	r	y	600
rusty	+	r	+	86
yucky	+	+	y	2,256
wildtype	+	+	+	903
TOTAL =				7,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes R and J. These genotypes result from crossover events that occur between the two genes R and J during meiosis.

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

A. jry Incorrect B. jr+ Incorrect C. j+y Correct D. j++ Correct E. +ry Correct F. +r+ Correct G. ++y Incorrect H. +++ Incorrect MA

d8ac_5d6f

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene J is related to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene T is related to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene 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, tipsy, yucky	j	t	y	1,188
jerky, tipsy	j	t	+	139
jerky, yucky	j	+	y	511
jerky	j	+	+	2,568
tipsy, yucky	+	t	y	2,478
tipsy	+	t	+	533
yucky	+	+	y	122
wildtype	+	+	+	1,161
TOTAL =				8,700

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes Y and J. These genotypes result from crossover events that occur between the two genes Y and J during meiosis.

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

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

3252_55ab

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is 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 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 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
horsey, prickly, waxy	h	p	w	495
horsey, prickly	h	p	+	46
horsey, waxy	h	+	w	259
horsey	h	+	+	87
prickly, waxy	+	p	w	102
prickly	+	p	+	254
waxy	+	+	w	35
wildtype	+	+	+	522
TOTAL =				1,800

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes H and W. These genotypes result from crossover events that occur between the two genes H and W during meiosis.

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

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

1061_15d8

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 H is linked with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene Y is 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
dewy, horsey, yucky	d	h	y	2,262
dewy, horsey	d	h	+	34
dewy, yucky	d	+	y	144
dewy	d	+	+	886
horsey, yucky	+	h	y	923
horsey	+	h	+	124
yucky	+	+	y	33
wildtype	+	+	+	2,294
TOTAL =				6,700

The resulting phenotypes are summarized in the table above.

Question

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

A. dhy Incorrect B. dh+ Incorrect C. d+y Correct D. d++ Correct E. +hy Correct F. +h+ Correct G. ++y Incorrect H. +++ Incorrect MA

6eab_b4ab

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 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 W is affiliated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
dewy, rusty, waxy	d	r	w	354
dewy, rusty	d	r	+	1,853
dewy, waxy	d	+	w	7
dewy	d	+	+	101
rusty, waxy	+	r	w	106
rusty	+	r	+	16
waxy	+	+	w	1,804
wildtype	+	+	+	359
TOTAL =				4,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes D and R. These genotypes result from crossover events that occur between the two genes D and R during meiosis.

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

A. drw Incorrect B. dr+ Incorrect C. d+w Correct D. d++ Correct E. +rw Correct F. +r+ Correct G. ++w Incorrect H. +++ Incorrect MA

ca81_1d9d

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene M is related to the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.
Gene N is affiliated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene W is associated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes			Progeny Count
mushy, nerdy, waxy	m	n	w	48
mushy, nerdy	m	n	+	163
mushy, waxy	m	+	w	387
mushy	m	+	+	840
nerdy, waxy	+	n	w	813
nerdy	+	n	+	354
waxy	+	+	w	179
wildtype	+	+	+	66
TOTAL =				2,850

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes W and N. These genotypes result from crossover events that occur between the two genes W and N during meiosis.

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

A. mnw Incorrect B. mn+ Correct C. m+w Correct D. m++ Incorrect E. +nw Incorrect F. +n+ Correct G. ++w Correct H. +++ Incorrect MA

5eb3_d617

Three-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is associated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene K is 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 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
dewy, kidney, yucky	d	k	y	125
dewy, kidney	d	k	+	336
dewy, yucky	d	+	y	54
dewy	d	+	+	9
kidney, yucky	+	k	y	11
kidney	+	k	+	76
yucky	+	+	y	294
wildtype	+	+	+	95
TOTAL =				1,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes K and Y. These genotypes result from crossover events that occur between the two genes K and Y during meiosis.

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

A. dky Correct B. dk+ Incorrect C. d+y Incorrect D. d++ Correct E. +ky Correct F. +k+ Incorrect G. ++y Incorrect H. +++ Correct MA

19de_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 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 J is linked with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene 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	239
bumpy, jerky	b	j	+	307
bumpy, xanthic	b	+	x	966
bumpy	b	+	+	11
jerky, xanthic	+	j	x	4
jerky	+	j	+	999
xanthic	+	+	x	278
wildtype	+	+	+	196
TOTAL =				3,000

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes B and X. These genotypes result from crossover events that occur between the two genes B and X during meiosis.

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

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

ff78_bd02

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 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 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, kidney, xanthic	a	k	x	397
artsy, kidney	a	k	+	1,050
artsy, xanthic	a	+	x	20
artsy	a	+	+	2,807
kidney, xanthic	+	k	x	2,826
kidney	+	k	+	23
xanthic	+	+	x	1,057
wildtype	+	+	+	420
TOTAL =				8,600

The resulting phenotypes are summarized in the table above.

Question

Based on the traits expressed in the offspring, identify the all recombinant genotypes for genes A and X. These genotypes result from crossover events that occur between the two genes A and X during meiosis.

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

A. akx Correct B. ak+ Incorrect C. a+x Correct D. a++ Incorrect E. +kx Incorrect F. +k+ Correct G. ++x Incorrect H. +++ Correct