11e0_6d63

Two-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 two-point test cross examines two (2) genes at the same time to learn about their assortment in gamete formation.

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

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

Characteristics of Recessive Phenotypes

Gene T is connected with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene Y is 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
tipsy, yucky	t	y	2,095
tipsy	t	+	1,360
yucky	+	y	1,440
wildtype	+	+	2,105
TOTAL =			7,000

The resulting phenotypes are summarized in the table above.

Question

Review the phenotype counts shown in the table. Based on the traits expressed in the offspring, identify the possible recombinant genotype combinations. These allele combinations have occurred due to genetic crossover. More than one combination will be correct. Select all that apply.

A. ty Incorrect B. t+ Correct C. +y Correct D. ++ Incorrect MA

9f9f_70e1

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
chummy, waxy	c	w	1,473
chummy	c	+	3,089
waxy	+	w	3,303
wildtype	+	+	1,535
TOTAL =			9,400

The resulting phenotypes are summarized in the table above.

Question

A. cw Correct B. c+ Incorrect C. +w Incorrect D. ++ Correct MA

af04_21c1

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 R is connected with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.

Phenotype	Genotypes		Progeny Count
artsy, rusty	a	r	920
artsy	a	+	153
rusty	+	r	177
wildtype	+	+	950
TOTAL =			2,200

The resulting phenotypes are summarized in the table above.

Question

A. ar Incorrect B. a+ Correct C. +r Correct D. ++ Incorrect MA

e530_4c09

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene E is linked with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene 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
eery, prickly	e	p	1,632
eery	e	+	1,028
prickly	+	p	1,078
wildtype	+	+	1,662
TOTAL =			5,400

The resulting phenotypes are summarized in the table above.

Question

A. ep Incorrect B. e+ Correct C. +p Correct D. ++ Incorrect MA

a0d1_03ba

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 M is linked with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.

Phenotype	Genotypes		Progeny Count
chummy, mushy	c	m	1,703
chummy	c	+	667
mushy	+	m	629
wildtype	+	+	1,801
TOTAL =			4,800

The resulting phenotypes are summarized in the table above.

Question

A. cm Incorrect B. c+ Correct C. +m Correct D. ++ Incorrect MA

4381_9e44

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
dewy, waxy	d	w	1,337
dewy	d	+	867
waxy	+	w	849
wildtype	+	+	1,347
TOTAL =			4,400

The resulting phenotypes are summarized in the table above.

Question

A. dw Incorrect B. d+ Correct C. +w Correct D. ++ Incorrect MA

3301_5629

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is related to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene T is 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
horsey, tipsy	h	t	254
horsey	h	+	2,710
tipsy	+	t	2,810
wildtype	+	+	226
TOTAL =			6,000

The resulting phenotypes are summarized in the table above.

Question

A. ht Correct B. h+ Incorrect C. +t Incorrect D. ++ Correct MA

24f8_f6cd

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene T is related to the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene W is 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
tipsy, waxy	t	w	1,038
tipsy	t	+	2,289
waxy	+	w	2,199
wildtype	+	+	1,074
TOTAL =			6,600

The resulting phenotypes are summarized in the table above.

Question

A. tw Correct B. t+ Incorrect C. +w Incorrect D. ++ Correct MA

9bf3_ef7b

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
bumpy, waxy	b	w	1,519
bumpy	b	+	906
waxy	+	w	944
wildtype	+	+	1,631
TOTAL =			5,000

The resulting phenotypes are summarized in the table above.

Question

A. bw Incorrect B. b+ Correct C. +w Correct D. ++ Incorrect MA

9dae_a0c8

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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.

Phenotype	Genotypes		Progeny Count
dewy, jerky	d	j	86
dewy	d	+	1,943
jerky	+	j	2,089
wildtype	+	+	82
TOTAL =			4,200

The resulting phenotypes are summarized in the table above.

Question

A. dj Correct B. d+ Incorrect C. +j Incorrect D. ++ Correct MA

4100_2bcd

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 T is linked with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes		Progeny Count
eery, tipsy	e	t	582
eery	e	+	2,888
tipsy	+	t	2,922
wildtype	+	+	608
TOTAL =			7,000

The resulting phenotypes are summarized in the table above.

Question

A. et Correct B. e+ Incorrect C. +t Incorrect D. ++ Correct MA

278c_bfee

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
kidney, mushy	k	m	1,478
kidney	k	+	3,059
mushy	+	m	2,971
wildtype	+	+	1,492
TOTAL =			9,000

The resulting phenotypes are summarized in the table above.

Question

A. km Correct B. k+ Incorrect C. +m Incorrect D. ++ Correct MA

c686_a0c8

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 J is associated with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.

Phenotype	Genotypes		Progeny Count
dewy, jerky	d	j	187
dewy	d	+	3,445
jerky	+	j	3,395
wildtype	+	+	173
TOTAL =			7,200

The resulting phenotypes are summarized in the table above.

Question

A. dj Correct B. d+ Incorrect C. +j Incorrect D. ++ Correct MA

4615_1ef8

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 P is affiliated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes		Progeny Count
jerky, prickly	j	p	217
jerky	j	+	496
prickly	+	p	470
wildtype	+	+	217
TOTAL =			1,400

The resulting phenotypes are summarized in the table above.

Question

A. jp Correct B. j+ Incorrect C. +p Incorrect D. ++ Correct MA

0ca9_7330

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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.

Phenotype	Genotypes		Progeny Count
nerdy, rusty	n	r	1,013
nerdy	n	+	491
rusty	+	r	529
wildtype	+	+	967
TOTAL =			3,000

The resulting phenotypes are summarized in the table above.

Question

A. nr Incorrect B. n+ Correct C. +r Correct D. ++ Incorrect MA

2d5a_31ed

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is analogous to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene P is associated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.

Phenotype	Genotypes		Progeny Count
horsey, prickly	h	p	3,706
horsey	h	+	791
prickly	+	p	829
wildtype	+	+	3,674
TOTAL =			9,000

The resulting phenotypes are summarized in the table above.

Question

A. hp Incorrect B. h+ Correct C. +p Correct D. ++ Incorrect MA

784c_2572

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is analogous to the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene 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
horsey, nerdy	h	n	603
horsey	h	+	1,659
nerdy	+	n	1,553
wildtype	+	+	585
TOTAL =			4,400

The resulting phenotypes are summarized in the table above.

Question

A. hn Correct B. h+ Incorrect C. +n Incorrect D. ++ Correct MA

0bbb_4e6d

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 J is connected with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.

Phenotype	Genotypes		Progeny Count
chummy, jerky	c	j	215
chummy	c	+	443
jerky	+	j	509
wildtype	+	+	233
TOTAL =			1,400

The resulting phenotypes are summarized in the table above.

Question

A. cj Correct B. c+ Incorrect C. +j Incorrect D. ++ Correct MA

656e_b151

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
fuzzy, waxy	f	w	3,737
fuzzy	f	+	591
waxy	+	w	641
wildtype	+	+	3,831
TOTAL =			8,800

The resulting phenotypes are summarized in the table above.

Question

A. fw Incorrect B. f+ Correct C. +w Correct D. ++ Incorrect MA

41d6_2d1a

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
jerky, rusty	j	r	2,185
jerky	j	+	972
rusty	+	r	1,012
wildtype	+	+	2,231
TOTAL =			6,400

The resulting phenotypes are summarized in the table above.

Question

A. jr Incorrect B. j+ Correct C. +r Correct D. ++ Incorrect MA

81c2_0884

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is linked with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene F is 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.

Phenotype	Genotypes		Progeny Count
dewy, fuzzy	d	f	475
dewy	d	+	40
fuzzy	+	f	30
wildtype	+	+	455
TOTAL =			1,000

The resulting phenotypes are summarized in the table above.

Question

A. df Incorrect B. d+ Correct C. +f Correct D. ++ Incorrect MA

bad2_06bc

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 related to the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.

Phenotype	Genotypes		Progeny Count
artsy, nerdy	a	n	48
artsy	a	+	1,091
nerdy	+	n	1,021
wildtype	+	+	40
TOTAL =			2,200

The resulting phenotypes are summarized in the table above.

Question

A. an Correct B. a+ Incorrect C. +n Incorrect D. ++ Correct MA

d8aa_b939

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 K is linked with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.

Phenotype	Genotypes		Progeny Count
dewy, kidney	d	k	3,940
dewy	d	+	830
kidney	+	k	802
wildtype	+	+	4,028
TOTAL =			9,600

The resulting phenotypes are summarized in the table above.

Question

A. dk Incorrect B. d+ Correct C. +k Correct D. ++ Incorrect MA

1b8f_6178

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
artsy, jerky	a	j	1,128
artsy	a	+	1,615
jerky	+	j	1,745
wildtype	+	+	1,112
TOTAL =			5,600

The resulting phenotypes are summarized in the table above.

Question

A. aj Correct B. a+ Incorrect C. +j Incorrect D. ++ Correct MA

c8b8_2572

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is connected with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene N is associated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.

Phenotype	Genotypes		Progeny Count
horsey, nerdy	h	n	3,663
horsey	h	+	714
nerdy	+	n	694
wildtype	+	+	3,729
TOTAL =			8,800

The resulting phenotypes are summarized in the table above.

Question

A. hn Incorrect B. h+ Correct C. +n Correct D. ++ Incorrect MA

21af_0884

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is associated with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene F is 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.

Phenotype	Genotypes		Progeny Count
dewy, fuzzy	d	f	363
dewy	d	+	241
fuzzy	+	f	239
wildtype	+	+	357
TOTAL =			1,200

The resulting phenotypes are summarized in the table above.

Question

A. df Incorrect B. d+ Correct C. +f Correct D. ++ Incorrect MA

b73a_d6d2

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene P is connected with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene R is 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
prickly, rusty	p	r	672
prickly	p	+	35
rusty	+	r	21
wildtype	+	+	672
TOTAL =			1,400

The resulting phenotypes are summarized in the table above.

Question

A. pr Incorrect B. p+ Correct C. +r Correct D. ++ Incorrect MA

576a_2572

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is correlated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene N is related to the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.

Phenotype	Genotypes		Progeny Count
horsey, nerdy	h	n	2,141
horsey	h	+	66
nerdy	+	n	66
wildtype	+	+	2,127
TOTAL =			4,400

The resulting phenotypes are summarized in the table above.

Question

A. hn Incorrect B. h+ Correct C. +n Correct D. ++ Incorrect MA

c69c_571b

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
kidney, yucky	k	y	628
kidney	k	+	1,984
yucky	+	y	1,916
wildtype	+	+	672
TOTAL =			5,200

The resulting phenotypes are summarized in the table above.

Question

A. ky Correct B. k+ Incorrect C. +y Incorrect D. ++ Correct MA

9bae_971e

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene E is analogous to the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene F is 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.

Phenotype	Genotypes		Progeny Count
eery, fuzzy	e	f	729
eery	e	+	2,338
fuzzy	+	f	2,282
wildtype	+	+	651
TOTAL =			6,000

The resulting phenotypes are summarized in the table above.

Question

A. ef Correct B. e+ Incorrect C. +f Incorrect D. ++ Correct MA

1cc5_7c3a

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is correlated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene W is affiliated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes		Progeny Count
horsey, waxy	h	w	2,831
horsey	h	+	849
waxy	+	w	853
wildtype	+	+	2,867
TOTAL =			7,400

The resulting phenotypes are summarized in the table above.

Question

A. hw Incorrect B. h+ Correct C. +w Correct D. ++ Incorrect MA

2e7e_971e

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
eery, fuzzy	e	f	263
eery	e	+	677
fuzzy	+	f	619
wildtype	+	+	241
TOTAL =			1,800

The resulting phenotypes are summarized in the table above.

Question

A. ef Correct B. e+ Incorrect C. +f Incorrect D. ++ Correct MA

d201_8381

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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, xanthic	e	x	1,005
eery	e	+	1,734
xanthic	+	x	1,722
wildtype	+	+	939
TOTAL =			5,400

The resulting phenotypes are summarized in the table above.

Question

A. ex Correct B. e+ Incorrect C. +x Incorrect D. ++ Correct MA

4c0c_f2be

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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, xanthic	c	x	188
chummy	c	+	1,712
xanthic	+	x	1,528
wildtype	+	+	172
TOTAL =			3,600

The resulting phenotypes are summarized in the table above.

Question

A. cx Correct B. c+ Incorrect C. +x Incorrect D. ++ Correct MA

5f2a_6d24

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 X is affiliated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes		Progeny Count
bumpy, xanthic	b	x	331
bumpy	b	+	196
xanthic	+	x	174
wildtype	+	+	299
TOTAL =			1,000

The resulting phenotypes are summarized in the table above.

Question

A. bx Incorrect B. b+ Correct C. +x Correct D. ++ Incorrect MA

69be_ef7b

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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, waxy	b	w	349
bumpy	b	+	4,215
waxy	+	w	4,249
wildtype	+	+	387
TOTAL =			9,200

The resulting phenotypes are summarized in the table above.

Question

A. bw Correct B. b+ Incorrect C. +w Incorrect D. ++ Correct MA

9136_532f

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
jerky, waxy	j	w	1,514
jerky	j	+	2,299
waxy	+	w	2,261
wildtype	+	+	1,526
TOTAL =			7,600

The resulting phenotypes are summarized in the table above.

Question

A. jw Correct B. j+ Incorrect C. +w Incorrect D. ++ Correct MA

c164_020f

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is correlated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene 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
horsey, rusty	h	r	566
horsey	h	+	3,977
rusty	+	r	3,943
wildtype	+	+	514
TOTAL =			9,000

The resulting phenotypes are summarized in the table above.

Question

A. hr Correct B. h+ Incorrect C. +r Incorrect D. ++ Correct MA

d065_9799

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes		Progeny Count
mushy, tipsy	m	t	382
mushy	m	+	2,810
tipsy	+	t	2,822
wildtype	+	+	386
TOTAL =			6,400

The resulting phenotypes are summarized in the table above.

Question

A. mt Correct B. m+ Incorrect C. +t Incorrect D. ++ Correct MA

487f_cc32

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
chummy, eery	c	e	2,174
chummy	c	+	936
eery	+	e	924
wildtype	+	+	2,166
TOTAL =			6,200

The resulting phenotypes are summarized in the table above.

Question

A. ce Incorrect B. c+ Correct C. +e Correct D. ++ Incorrect MA

a1f2_d5c3

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
chummy, dewy	c	d	311
chummy	c	+	504
dewy	+	d	488
wildtype	+	+	297
TOTAL =			1,600

The resulting phenotypes are summarized in the table above.

Question

A. cd Correct B. c+ Incorrect C. +d Incorrect D. ++ Correct MA

baab_0d05

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 W is associated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes		Progeny Count
nerdy, waxy	n	w	2,821
nerdy	n	+	1,810
waxy	+	w	1,870
wildtype	+	+	2,699
TOTAL =			9,200

The resulting phenotypes are summarized in the table above.

Question

A. nw Incorrect B. n+ Correct C. +w Correct D. ++ Incorrect MA

1115_5629

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
horsey, tipsy	h	t	263
horsey	h	+	1,672
tipsy	+	t	1,596
wildtype	+	+	269
TOTAL =			3,800

The resulting phenotypes are summarized in the table above.

Question

A. ht Correct B. h+ Incorrect C. +t Incorrect D. ++ Correct MA

8f25_932a

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
dewy, horsey	d	h	1,552
dewy	d	+	178
horsey	+	h	196
wildtype	+	+	1,474
TOTAL =			3,400

The resulting phenotypes are summarized in the table above.

Question

A. dh Incorrect B. d+ Correct C. +h Correct D. ++ Incorrect MA

ea66_9799

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
mushy, tipsy	m	t	3,596
mushy	m	+	1,021
tipsy	+	t	1,047
wildtype	+	+	3,736
TOTAL =			9,400

The resulting phenotypes are summarized in the table above.

Question

A. mt Incorrect B. m+ Correct C. +t Correct D. ++ Incorrect MA

e597_e621

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
chummy, fuzzy	c	f	618
chummy	c	+	251
fuzzy	+	f	253
wildtype	+	+	678
TOTAL =			1,800

The resulting phenotypes are summarized in the table above.

Question

A. cf Incorrect B. c+ Correct C. +f Correct D. ++ Incorrect MA

a581_01de

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 W is analogous to the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes		Progeny Count
eery, waxy	e	w	788
eery	e	+	1,362
waxy	+	w	1,284
wildtype	+	+	766
TOTAL =			4,200

The resulting phenotypes are summarized in the table above.

Question

A. ew Correct B. e+ Incorrect C. +w Incorrect D. ++ Correct MA

028c_ade1

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene R is linked with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene T is linked with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.

Phenotype	Genotypes		Progeny Count
rusty, tipsy	r	t	174
rusty	r	+	3,935
tipsy	+	t	4,129
wildtype	+	+	162
TOTAL =			8,400

The resulting phenotypes are summarized in the table above.

Question

A. rt Correct B. r+ Incorrect C. +t Incorrect D. ++ Correct MA

8121_2297

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is analogous to the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene E is 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.

Phenotype	Genotypes		Progeny Count
dewy, eery	d	e	586
dewy	d	+	1,529
eery	+	e	1,495
wildtype	+	+	590
TOTAL =			4,200

The resulting phenotypes are summarized in the table above.

Question

A. de Correct B. d+ Incorrect C. +e Incorrect D. ++ Correct MA

1a79_bc3f

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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 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.

Phenotype	Genotypes		Progeny Count
fuzzy, horsey	f	h	2,858
fuzzy	f	+	200
horsey	+	h	234
wildtype	+	+	2,908
TOTAL =			6,200

The resulting phenotypes are summarized in the table above.

Question

A. fh Incorrect B. f+ Correct C. +h Correct D. ++ Incorrect MA

f852_3349

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes		Progeny Count
prickly, yucky	p	y	2,027
prickly	p	+	1,125
yucky	+	y	1,107
wildtype	+	+	1,941
TOTAL =			6,200

The resulting phenotypes are summarized in the table above.

Question

A. py Incorrect B. p+ Correct C. +y Correct D. ++ Incorrect MA

aaf4_f2be

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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, xanthic	c	x	740
chummy	c	+	447
xanthic	+	x	465
wildtype	+	+	748
TOTAL =			2,400

The resulting phenotypes are summarized in the table above.

Question

A. cx Incorrect B. c+ Correct C. +x Correct D. ++ Incorrect MA

c577_532f

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes		Progeny Count
jerky, waxy	j	w	449
jerky	j	+	1,959
waxy	+	w	1,929
wildtype	+	+	463
TOTAL =			4,800

The resulting phenotypes are summarized in the table above.

Question

A. jw Correct B. j+ Incorrect C. +w Incorrect D. ++ Correct MA

bf5b_2572

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is correlated with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene 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
horsey, nerdy	h	n	885
horsey	h	+	3,885
nerdy	+	n	3,823
wildtype	+	+	807
TOTAL =			9,400

The resulting phenotypes are summarized in the table above.

Question

A. hn Correct B. h+ Incorrect C. +n Incorrect D. ++ Correct MA

7e81_1c5c

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene R is associated with the 'rusty' phenotype. A fruit fly that is homozygous recessive for Gene R has a reddish-brown color, much like rusted iron metal.
Gene Y is related to the 'yucky' phenotype. A fruit fly that is homozygous recessive for Gene Y gives off an unpleasant odor and has a generally unappealing look.

Phenotype	Genotypes		Progeny Count
rusty, yucky	r	y	302
rusty	r	+	2,205
yucky	+	y	2,195
wildtype	+	+	298
TOTAL =			5,000

The resulting phenotypes are summarized in the table above.

Question

A. ry Correct B. r+ Incorrect C. +y Incorrect D. ++ Correct MA

c4f7_4eea

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene K is connected with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene 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
kidney, xanthic	k	x	1,925
kidney	k	+	1,190
xanthic	+	x	1,104
wildtype	+	+	1,981
TOTAL =			6,200

The resulting phenotypes are summarized in the table above.

Question

A. kx Incorrect B. k+ Correct C. +x Correct D. ++ Incorrect MA

ee36_1c1b

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
dewy, xanthic	d	x	2,948
dewy	d	+	1,084
xanthic	+	x	1,076
wildtype	+	+	2,892
TOTAL =			8,000

The resulting phenotypes are summarized in the table above.

Question

A. dx Incorrect B. d+ Correct C. +x Correct D. ++ Incorrect MA

ac3a_2aff

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene F is associated with the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.
Gene Y is 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
fuzzy, yucky	f	y	584
fuzzy	f	+	1,866
yucky	+	y	1,934
wildtype	+	+	616
TOTAL =			5,000

The resulting phenotypes are summarized in the table above.

Question

A. fy Correct B. f+ Incorrect C. +y Incorrect D. ++ Correct MA

5083_7492

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene T is associated with the 'tipsy' phenotype. A fruit fly that is homozygous recessive for Gene T moves in an erratic path, suggesting a lack of coordination, as if intoxicated.
Gene X is 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
tipsy, xanthic	t	x	3,676
tipsy	t	+	206
xanthic	+	x	184
wildtype	+	+	3,734
TOTAL =			7,800

The resulting phenotypes are summarized in the table above.

Question

A. tx Incorrect B. t+ Correct C. +x Correct D. ++ Incorrect MA

1d91_aef0

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes		Progeny Count
artsy, bumpy	a	b	637
artsy	a	+	1,294
bumpy	+	b	1,290
wildtype	+	+	579
TOTAL =			3,800

The resulting phenotypes are summarized in the table above.

Question

A. ab Correct B. a+ Incorrect C. +b Incorrect D. ++ Correct MA

693b_5629

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene H is connected with the 'horsey' phenotype. A fruit fly that is homozygous recessive for Gene H is quite big and strong-looking, much larger than your typical fruit fly.
Gene 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
horsey, tipsy	h	t	1,911
horsey	h	+	313
tipsy	+	t	303
wildtype	+	+	1,873
TOTAL =			4,400

The resulting phenotypes are summarized in the table above.

Question

A. ht Incorrect B. h+ Correct C. +t Correct D. ++ Incorrect MA

fa85_d6d2

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene P is correlated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene R is 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
prickly, rusty	p	r	1,288
prickly	p	+	102
rusty	+	r	122
wildtype	+	+	1,288
TOTAL =			2,800

The resulting phenotypes are summarized in the table above.

Question

A. pr Incorrect B. p+ Correct C. +r Correct D. ++ Incorrect MA

88ef_5ff4

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 W is associated with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes		Progeny Count
artsy, waxy	a	w	1,428
artsy	a	+	196
waxy	+	w	220
wildtype	+	+	1,356
TOTAL =			3,200

The resulting phenotypes are summarized in the table above.

Question

A. aw Incorrect B. a+ Correct C. +w Correct D. ++ Incorrect MA

bc84_40d2

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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 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
nerdy, prickly	n	p	39
nerdy	n	+	1,963
prickly	+	p	1,957
wildtype	+	+	41
TOTAL =			4,000

The resulting phenotypes are summarized in the table above.

Question

A. np Correct B. n+ Incorrect C. +p Incorrect D. ++ Correct MA

07f0_ed1f

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 associated with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.

Phenotype	Genotypes		Progeny Count
dewy, mushy	d	m	1,741
dewy	d	+	46
mushy	+	m	62
wildtype	+	+	1,751
TOTAL =			3,600

The resulting phenotypes are summarized in the table above.

Question

A. dm Incorrect B. d+ Correct C. +m Correct D. ++ Incorrect MA

f2d7_d393

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is connected with the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene P is 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
dewy, prickly	d	p	398
dewy	d	+	986
prickly	+	p	1,002
wildtype	+	+	414
TOTAL =			2,800

The resulting phenotypes are summarized in the table above.

Question

A. dp Correct B. d+ Incorrect C. +p Incorrect D. ++ Correct MA

3cba_3d36

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
chummy, prickly	c	p	2,524
chummy	c	+	45
prickly	+	p	59
wildtype	+	+	2,572
TOTAL =			5,200

The resulting phenotypes are summarized in the table above.

Question

A. cp Incorrect B. c+ Correct C. +p Correct D. ++ Incorrect MA

c6b0_c934

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
artsy, fuzzy	a	f	2,805
artsy	a	+	1,390
fuzzy	+	f	1,382
wildtype	+	+	2,823
TOTAL =			8,400

The resulting phenotypes are summarized in the table above.

Question

A. af Incorrect B. a+ Correct C. +f Correct D. ++ Incorrect MA

363c_2716

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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 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
nerdy, tipsy	n	t	492
nerdy	n	+	1,140
tipsy	+	t	1,068
wildtype	+	+	500
TOTAL =			3,200

The resulting phenotypes are summarized in the table above.

Question

A. nt Correct B. n+ Incorrect C. +t Incorrect D. ++ Correct MA

104c_95fd

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
kidney, nerdy	k	n	1,213
kidney	k	+	375
nerdy	+	n	361
wildtype	+	+	1,251
TOTAL =			3,200

The resulting phenotypes are summarized in the table above.

Question

A. kn Incorrect B. k+ Correct C. +n Correct D. ++ Incorrect MA

9b84_d1f7

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene B is associated with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene J is related to the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.

Phenotype	Genotypes		Progeny Count
bumpy, jerky	b	j	523
bumpy	b	+	4,174
jerky	+	j	4,370
wildtype	+	+	533
TOTAL =			9,600

The resulting phenotypes are summarized in the table above.

Question

A. bj Correct B. b+ Incorrect C. +j Incorrect D. ++ Correct MA

be55_8381

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene E is linked with the 'eery' phenotype. A fruit fly that is homozygous recessive for Gene E appears to have something off, crooked limbs and other twisted appendages.
Gene 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
eery, xanthic	e	x	4,196
eery	e	+	457
xanthic	+	x	463
wildtype	+	+	4,084
TOTAL =			9,200

The resulting phenotypes are summarized in the table above.

Question

A. ex Incorrect B. e+ Correct C. +x Correct D. ++ Incorrect MA

54ac_571b

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene K is correlated with the 'kidney' phenotype. A fruit fly that is homozygous recessive for Gene K has a body shape that is curved, similar to a kidney bean.
Gene 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
kidney, yucky	k	y	4,280
kidney	k	+	507
yucky	+	y	453
wildtype	+	+	4,360
TOTAL =			9,600

The resulting phenotypes are summarized in the table above.

Question

A. ky Incorrect B. k+ Correct C. +y Correct D. ++ Incorrect MA

2008_e621

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene C is related to the 'chummy' phenotype. A fruit fly that is homozygous recessive for Gene C shows behavior where it always maintains a close distance to other flies.
Gene F is analogous to the 'fuzzy' phenotype. A fruit fly that is homozygous recessive for Gene F is covered in a dense layer of hairs, giving it a soft appearance.

Phenotype	Genotypes		Progeny Count
chummy, fuzzy	c	f	931
chummy	c	+	3,806
fuzzy	+	f	3,808
wildtype	+	+	855
TOTAL =			9,400

The resulting phenotypes are summarized in the table above.

Question

A. cf Correct B. c+ Incorrect C. +f Incorrect D. ++ Correct MA

c0ca_82f4

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene P is affiliated with the 'prickly' phenotype. A fruit fly that is homozygous recessive for Gene P is covered with sharp bristles, giving it a spiky texture.
Gene T is 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
prickly, tipsy	p	t	1,105
prickly	p	+	342
tipsy	+	t	330
wildtype	+	+	1,023
TOTAL =			2,800

The resulting phenotypes are summarized in the table above.

Question

A. pt Incorrect B. p+ Correct C. +t Correct D. ++ Incorrect MA

c8d0_9c20

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 M is connected with the 'mushy' phenotype. A fruit fly that is homozygous recessive for Gene M feels soft to the touch and unusually squishy, unlike the usual firmness.

Phenotype	Genotypes		Progeny Count
bumpy, mushy	b	m	2,438
bumpy	b	+	862
mushy	+	m	854
wildtype	+	+	2,446
TOTAL =			6,600

The resulting phenotypes are summarized in the table above.

Question

A. bm Incorrect B. b+ Correct C. +m Correct D. ++ Incorrect MA

6d47_6178

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 J is connected with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.

Phenotype	Genotypes		Progeny Count
artsy, jerky	a	j	1,196
artsy	a	+	2,651
jerky	+	j	2,731
wildtype	+	+	1,222
TOTAL =			7,800

The resulting phenotypes are summarized in the table above.

Question

A. aj Correct B. a+ Incorrect C. +j Incorrect D. ++ Correct MA

a7ed_c20a

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes		Progeny Count
fuzzy, mushy	f	m	3,696
fuzzy	f	+	403
mushy	+	m	417
wildtype	+	+	3,684
TOTAL =			8,200

The resulting phenotypes are summarized in the table above.

Question

A. fm Incorrect B. f+ Correct C. +m Correct D. ++ Incorrect MA

dd06_4e6d

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes		Progeny Count
chummy, jerky	c	j	3,430
chummy	c	+	1,063
jerky	+	j	1,097
wildtype	+	+	3,410
TOTAL =			9,000

The resulting phenotypes are summarized in the table above.

Question

A. cj Incorrect B. c+ Correct C. +j Correct D. ++ Incorrect MA

f591_e071

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene D is analogous to the 'dewy' phenotype. A fruit fly that is homozygous recessive for Gene D appears moist, with its body covered in tiny droplets of water.
Gene R is 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
dewy, rusty	d	r	4,406
dewy	d	+	431
rusty	+	r	433
wildtype	+	+	4,330
TOTAL =			9,600

The resulting phenotypes are summarized in the table above.

Question

A. dr Incorrect B. d+ Correct C. +r Correct D. ++ Incorrect MA

2a8a_79bb

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
bumpy, fuzzy	b	f	1,597
bumpy	b	+	559
fuzzy	+	f	491
wildtype	+	+	1,553
TOTAL =			4,200

The resulting phenotypes are summarized in the table above.

Question

A. bf Incorrect B. b+ Correct C. +f Correct D. ++ Incorrect MA

093c_7d8f

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
chummy, horsey	c	h	370
chummy	c	+	3,228
horsey	+	h	3,432
wildtype	+	+	370
TOTAL =			7,400

The resulting phenotypes are summarized in the table above.

Question

A. ch Correct B. c+ Incorrect C. +h Incorrect D. ++ Correct MA

8326_82f4

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
prickly, tipsy	p	t	1,361
prickly	p	+	2,610
tipsy	+	t	2,590
wildtype	+	+	1,439
TOTAL =			8,000

The resulting phenotypes are summarized in the table above.

Question

A. pt Correct B. p+ Incorrect C. +t Incorrect D. ++ Correct MA

0c18_3349

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
prickly, yucky	p	y	155
prickly	p	+	344
yucky	+	y	356
wildtype	+	+	145
TOTAL =			1,000

The resulting phenotypes are summarized in the table above.

Question

A. py Correct B. p+ Incorrect C. +y Incorrect D. ++ Correct MA

c99d_330e

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 X is associated with the 'xanthic' phenotype. A fruit fly that is homozygous recessive for Gene X has a fluorescent bright yellow coloring.

Phenotype	Genotypes		Progeny Count
fuzzy, xanthic	f	x	2,544
fuzzy	f	+	772
xanthic	+	x	792
wildtype	+	+	2,692
TOTAL =			6,800

The resulting phenotypes are summarized in the table above.

Question

A. fx Incorrect B. f+ Correct C. +x Correct D. ++ Incorrect MA

cffa_c70c

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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.

Phenotype	Genotypes		Progeny Count
dewy, nerdy	d	n	1,171
dewy	d	+	2,671
nerdy	+	n	2,789
wildtype	+	+	1,169
TOTAL =			7,800

The resulting phenotypes are summarized in the table above.

Question

A. dn Correct B. d+ Incorrect C. +n Incorrect D. ++ Correct MA

2ec6_793c

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
jerky, tipsy	j	t	4,428
jerky	j	+	100
tipsy	+	t	80
wildtype	+	+	4,392
TOTAL =			9,000

The resulting phenotypes are summarized in the table above.

Question

A. jt Incorrect B. j+ Correct C. +t Correct D. ++ Incorrect MA

4108_fad6

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
artsy, dewy	a	d	324
artsy	a	+	1,787
dewy	+	d	1,741
wildtype	+	+	348
TOTAL =			4,200

The resulting phenotypes are summarized in the table above.

Question

A. ad Correct B. a+ Incorrect C. +d Incorrect D. ++ Correct MA

3dbe_1ef8

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene J is connected with the 'jerky' phenotype. A fruit fly that is homozygous recessive for Gene J moves in rapid and sudden movements, displaying an unpredictable flight pattern.
Gene 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, prickly	j	p	3,317
jerky	j	+	564
prickly	+	p	528
wildtype	+	+	3,391
TOTAL =			7,800

The resulting phenotypes are summarized in the table above.

Question

A. jp Incorrect B. j+ Correct C. +p Correct D. ++ Incorrect MA

34c8_793c

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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

Phenotype	Genotypes		Progeny Count
jerky, tipsy	j	t	1,033
jerky	j	+	2,109
tipsy	+	t	2,045
wildtype	+	+	1,013
TOTAL =			6,200

The resulting phenotypes are summarized in the table above.

Question

A. jt Correct B. j+ Incorrect C. +t Incorrect D. ++ Correct MA

920f_2716

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene N is associated with the 'nerdy' phenotype. A fruit fly that is homozygous recessive for Gene N has large, prominent eyes that stand out, much like thick-rimmed glasses.
Gene 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
nerdy, tipsy	n	t	353
nerdy	n	+	1,545
tipsy	+	t	1,533
wildtype	+	+	369
TOTAL =			3,800

The resulting phenotypes are summarized in the table above.

Question

A. nt Correct B. n+ Incorrect C. +t Incorrect D. ++ Correct MA

5ebd_fc86

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

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 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
fuzzy, prickly	f	p	614
fuzzy	f	+	4,110
prickly	+	p	4,068
wildtype	+	+	608
TOTAL =			9,400

The resulting phenotypes are summarized in the table above.

Question

A. fp Correct B. f+ Incorrect C. +p Incorrect D. ++ Correct MA

7ade_c806

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
bumpy, kidney	b	k	622
bumpy	b	+	1,160
kidney	+	k	1,180
wildtype	+	+	638
TOTAL =			3,600

The resulting phenotypes are summarized in the table above.

Question

A. bk Correct B. b+ Incorrect C. +k Incorrect D. ++ Correct MA

6322_2ab8

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
prickly, xanthic	p	x	2,368
prickly	p	+	286
xanthic	+	x	286
wildtype	+	+	2,260
TOTAL =			5,200

The resulting phenotypes are summarized in the table above.

Question

A. px Incorrect B. p+ Correct C. +x Correct D. ++ Incorrect MA

890b_87f2

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 W is linked with the 'waxy' phenotype. A fruit fly that is homozygous recessive for Gene W has a thick protective layer that is water resistant and opague.

Phenotype	Genotypes		Progeny Count
rusty, waxy	r	w	117
rusty	r	+	3,585
waxy	+	w	3,593
wildtype	+	+	105
TOTAL =			7,400

The resulting phenotypes are summarized in the table above.

Question

A. rw Correct B. r+ Incorrect C. +w Incorrect D. ++ Correct MA

6377_e071

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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
dewy, rusty	d	r	2,279
dewy	d	+	867
rusty	+	r	807
wildtype	+	+	2,247
TOTAL =			6,200

The resulting phenotypes are summarized in the table above.

Question

A. dr Incorrect B. d+ Correct C. +r Correct D. ++ Incorrect MA

ee1f_c934

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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.

Phenotype	Genotypes		Progeny Count
artsy, fuzzy	a	f	1,804
artsy	a	+	598
fuzzy	+	f	602
wildtype	+	+	1,796
TOTAL =			4,800

The resulting phenotypes are summarized in the table above.

Question

A. af Incorrect B. a+ Correct C. +f Correct D. ++ Incorrect MA

c487_79bb

Two-Point Test Cross Problem

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

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

Characteristics of Recessive Phenotypes

Gene B is connected with the 'bumpy' phenotype. A fruit fly that is homozygous recessive for Gene B has a skin texture that is not smooth, but rough with small bumps all over.
Gene F is 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
bumpy, fuzzy	b	f	313
bumpy	b	+	743
fuzzy	+	f	819
wildtype	+	+	325
TOTAL =			2,200

The resulting phenotypes are summarized in the table above.

Question

A. bf Correct B. b+ Incorrect C. +f Incorrect D. ++ Correct MA

d084_9e44

Two-Point Test Cross Problem

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

For this problem, a test cross using a fruit fly (Drosophila melanogaster) heterozygous for two 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 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, waxy	d	w	412
dewy	d	+	2,049
waxy	+	w	1,935
wildtype	+	+	404
TOTAL =			4,800

The resulting phenotypes are summarized in the table above.

Question

A. dw Correct B. d+ Incorrect C. +w Incorrect D. ++ Correct