In Drosophila , the autosomal recessive brown eye color mutation displays interactions with both the X-linked recessive vermilion mutation and the autosomal recessive scarlet mutation. Flies homozygous for brown and simultaneously hemizygous or homozygous for vermilion have white eyes. Flies simultaneously homozygous for both the brown and scarlet mutations also have white eyes. Predict the F1 and F2 progeny of crossing the following true-breeding parents: a. vermilion females × brown males b. brown females × vermilion males c. scarlet females × brown males d. brown females × scarlet males

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Answer 1

Textbook Question

Chapter 4, Problem 29P

In Drosophila, the autosomal recessive brown eye color mutation displays interactions with both the X-linked recessive vermilion mutation and the autosomal recessive scarlet mutation. Flies homozygous for brown and simultaneously hemizygous or homozygous for vermilion have white eyes. Flies simultaneously homozygous for both the brown and scarlet mutations also have white eyes. Predict the F1 and F2 progeny of crossing the following true-breeding parents:

a. vermilion females × brown males

b. brown females × vermilion males

c. scarlet females × brown males

d. brown females × scarlet males

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between vermilion females and brown males

Introduction:

The genes are the sequence of nucleotides that are present on the chromosomes and encode for a specific protein that plays a crucial role in the functioning of the different processes in an organism. The gene is located at specific gene loci and can be structural or regulatory in nature.

Explanation of Solution

The allele for vermillion trait can be expressed as (X^VX^V) and the allele for brown trait is (E^bE^b). The F1 progeny from cross between vermilion females and brown males will be as follows:

Gametes	X^V	X^V
E^b	X^VE^b	X^VE^b
E^b	X^V E^b	X^V E^b

The F2 progeny will be as follows:

Gametes	X^V	E^b
X^V	X^V X^V	X^V E^b
E^b	X^V E^b	X^b E^b

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism. The alleles are the contrasting forms of a gene and one of them is dominant and other is recessive

Explanation of Solution

The vermillion males can be expressed as (X^VY) and the brown females can be expressed as (E^bE^b). The progeny from the cross of vermilion males and brown females will be as follows:

Gametes	E^b	E^b
X^V	X^VE^b	X^VX^b
Y	E^b Y	E^b Y

The progeny obtained from the F2 cross will be

Gametes	E^b	Y
X^V	X^V E^b	X^VY
E^b	E^b E^b	E^b Y

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive phenotype is only expressed under homozygous condition.

Explanation of Solution

The scarlet females can be expressed through alleles (E^SE^S) and the brown males are expressed as (E^bE^b). The progeny from the cross of brown males and scarlet females will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and scarlet males

Introduction:

Fertilization is the process by which the male gamete, sperm, fertilize with the female gamete, ovary. The process brings about the fusion of two haploid pronuclei into a diploid zygote.

Explanation of Solution

The brown females can be seen as (E^bE^b) and scarlet males are represented as (E^SE^S). The progeny from the cross of brown females and scarlet males will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

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Answer 2

Textbook Question

Chapter 4, Problem 29P

In Drosophila, the autosomal recessive brown eye color mutation displays interactions with both the X-linked recessive vermilion mutation and the autosomal recessive scarlet mutation. Flies homozygous for brown and simultaneously hemizygous or homozygous for vermilion have white eyes. Flies simultaneously homozygous for both the brown and scarlet mutations also have white eyes. Predict the F1 and F2 progeny of crossing the following true-breeding parents:

a. vermilion females × brown males

b. brown females × vermilion males

c. scarlet females × brown males

d. brown females × scarlet males

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between vermilion females and brown males

Introduction:

The genes are the sequence of nucleotides that are present on the chromosomes and encode for a specific protein that plays a crucial role in the functioning of the different processes in an organism. The gene is located at specific gene loci and can be structural or regulatory in nature.

Explanation of Solution

The allele for vermillion trait can be expressed as (X^VX^V) and the allele for brown trait is (E^bE^b). The F1 progeny from cross between vermilion females and brown males will be as follows:

Gametes	X^V	X^V
E^b	X^VE^b	X^VE^b
E^b	X^V E^b	X^V E^b

The F2 progeny will be as follows:

Gametes	X^V	E^b
X^V	X^V X^V	X^V E^b
E^b	X^V E^b	X^b E^b

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism. The alleles are the contrasting forms of a gene and one of them is dominant and other is recessive

Explanation of Solution

The vermillion males can be expressed as (X^VY) and the brown females can be expressed as (E^bE^b). The progeny from the cross of vermilion males and brown females will be as follows:

Gametes	E^b	E^b
X^V	X^VE^b	X^VX^b
Y	E^b Y	E^b Y

The progeny obtained from the F2 cross will be

Gametes	E^b	Y
X^V	X^V E^b	X^VY
E^b	E^b E^b	E^b Y

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive phenotype is only expressed under homozygous condition.

Explanation of Solution

The scarlet females can be expressed through alleles (E^SE^S) and the brown males are expressed as (E^bE^b). The progeny from the cross of brown males and scarlet females will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and scarlet males

Introduction:

Fertilization is the process by which the male gamete, sperm, fertilize with the female gamete, ovary. The process brings about the fusion of two haploid pronuclei into a diploid zygote.

Explanation of Solution

The brown females can be seen as (E^bE^b) and scarlet males are represented as (E^SE^S). The progeny from the cross of brown females and scarlet males will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

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Answer 3

Textbook Question

Chapter 4, Problem 29P

In Drosophila, the autosomal recessive brown eye color mutation displays interactions with both the X-linked recessive vermilion mutation and the autosomal recessive scarlet mutation. Flies homozygous for brown and simultaneously hemizygous or homozygous for vermilion have white eyes. Flies simultaneously homozygous for both the brown and scarlet mutations also have white eyes. Predict the F1 and F2 progeny of crossing the following true-breeding parents:

a. vermilion females × brown males

b. brown females × vermilion males

c. scarlet females × brown males

d. brown females × scarlet males

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between vermilion females and brown males

Introduction:

The genes are the sequence of nucleotides that are present on the chromosomes and encode for a specific protein that plays a crucial role in the functioning of the different processes in an organism. The gene is located at specific gene loci and can be structural or regulatory in nature.

Explanation of Solution

The allele for vermillion trait can be expressed as (X^VX^V) and the allele for brown trait is (E^bE^b). The F1 progeny from cross between vermilion females and brown males will be as follows:

Gametes	X^V	X^V
E^b	X^VE^b	X^VE^b
E^b	X^V E^b	X^V E^b

The F2 progeny will be as follows:

Gametes	X^V	E^b
X^V	X^V X^V	X^V E^b
E^b	X^V E^b	X^b E^b

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism. The alleles are the contrasting forms of a gene and one of them is dominant and other is recessive

Explanation of Solution

The vermillion males can be expressed as (X^VY) and the brown females can be expressed as (E^bE^b). The progeny from the cross of vermilion males and brown females will be as follows:

Gametes	E^b	E^b
X^V	X^VE^b	X^VX^b
Y	E^b Y	E^b Y

The progeny obtained from the F2 cross will be

Gametes	E^b	Y
X^V	X^V E^b	X^VY
E^b	E^b E^b	E^b Y

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive phenotype is only expressed under homozygous condition.

Explanation of Solution

The scarlet females can be expressed through alleles (E^SE^S) and the brown males are expressed as (E^bE^b). The progeny from the cross of brown males and scarlet females will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and scarlet males

Introduction:

Fertilization is the process by which the male gamete, sperm, fertilize with the female gamete, ovary. The process brings about the fusion of two haploid pronuclei into a diploid zygote.

Explanation of Solution

The brown females can be seen as (E^bE^b) and scarlet males are represented as (E^SE^S). The progeny from the cross of brown females and scarlet males will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

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Answer 4

Textbook Question

Chapter 4, Problem 29P

In Drosophila, the autosomal recessive brown eye color mutation displays interactions with both the X-linked recessive vermilion mutation and the autosomal recessive scarlet mutation. Flies homozygous for brown and simultaneously hemizygous or homozygous for vermilion have white eyes. Flies simultaneously homozygous for both the brown and scarlet mutations also have white eyes. Predict the F1 and F2 progeny of crossing the following true-breeding parents:

a. vermilion females × brown males

b. brown females × vermilion males

c. scarlet females × brown males

d. brown females × scarlet males

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between vermilion females and brown males

Introduction:

The genes are the sequence of nucleotides that are present on the chromosomes and encode for a specific protein that plays a crucial role in the functioning of the different processes in an organism. The gene is located at specific gene loci and can be structural or regulatory in nature.

Explanation of Solution

The allele for vermillion trait can be expressed as (X^VX^V) and the allele for brown trait is (E^bE^b). The F1 progeny from cross between vermilion females and brown males will be as follows:

Gametes	X^V	X^V
E^b	X^VE^b	X^VE^b
E^b	X^V E^b	X^V E^b

The F2 progeny will be as follows:

Gametes	X^V	E^b
X^V	X^V X^V	X^V E^b
E^b	X^V E^b	X^b E^b

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism. The alleles are the contrasting forms of a gene and one of them is dominant and other is recessive

Explanation of Solution

The vermillion males can be expressed as (X^VY) and the brown females can be expressed as (E^bE^b). The progeny from the cross of vermilion males and brown females will be as follows:

Gametes	E^b	E^b
X^V	X^VE^b	X^VX^b
Y	E^b Y	E^b Y

The progeny obtained from the F2 cross will be

Gametes	E^b	Y
X^V	X^V E^b	X^VY
E^b	E^b E^b	E^b Y

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive phenotype is only expressed under homozygous condition.

Explanation of Solution

The scarlet females can be expressed through alleles (E^SE^S) and the brown males are expressed as (E^bE^b). The progeny from the cross of brown males and scarlet females will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and scarlet males

Introduction:

Fertilization is the process by which the male gamete, sperm, fertilize with the female gamete, ovary. The process brings about the fusion of two haploid pronuclei into a diploid zygote.

Explanation of Solution

The brown females can be seen as (E^bE^b) and scarlet males are represented as (E^SE^S). The progeny from the cross of brown females and scarlet males will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

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Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between vermilion females and brown males

Introduction:

The genes are the sequence of nucleotides that are present on the chromosomes and encode for a specific protein that plays a crucial role in the functioning of the different processes in an organism. The gene is located at specific gene loci and can be structural or regulatory in nature.

Explanation of Solution

The allele for vermillion trait can be expressed as (X^VX^V) and the allele for brown trait is (E^bE^b). The F1 progeny from cross between vermilion females and brown males will be as follows:

Gametes	X^V	X^V
E^b	X^VE^b	X^VE^b
E^b	X^V E^b	X^V E^b

The F2 progeny will be as follows:

Gametes	X^V	E^b
X^V	X^V X^V	X^V E^b
E^b	X^V E^b	X^b E^b

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism. The alleles are the contrasting forms of a gene and one of them is dominant and other is recessive

Explanation of Solution

The vermillion males can be expressed as (X^VY) and the brown females can be expressed as (E^bE^b). The progeny from the cross of vermilion males and brown females will be as follows:

Gametes	E^b	E^b
X^V	X^VE^b	X^VX^b
Y	E^b Y	E^b Y

The progeny obtained from the F2 cross will be

Gametes	E^b	Y
X^V	X^V E^b	X^VY
E^b	E^b E^b	E^b Y

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive phenotype is only expressed under homozygous condition.

Explanation of Solution

The scarlet females can be expressed through alleles (E^SE^S) and the brown males are expressed as (E^bE^b). The progeny from the cross of brown males and scarlet females will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and scarlet males

Introduction:

Fertilization is the process by which the male gamete, sperm, fertilize with the female gamete, ovary. The process brings about the fusion of two haploid pronuclei into a diploid zygote.

Explanation of Solution

The brown females can be seen as (E^bE^b) and scarlet males are represented as (E^SE^S). The progeny from the cross of brown females and scarlet males will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Answer 8

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between vermilion females and brown males

Introduction:

The genes are the sequence of nucleotides that are present on the chromosomes and encode for a specific protein that plays a crucial role in the functioning of the different processes in an organism. The gene is located at specific gene loci and can be structural or regulatory in nature.

Explanation of Solution

The allele for vermillion trait can be expressed as (X^VX^V) and the allele for brown trait is (E^bE^b). The F1 progeny from cross between vermilion females and brown males will be as follows:

Gametes	X^V	X^V
E^b	X^VE^b	X^VE^b
E^b	X^V E^b	X^V E^b

The F2 progeny will be as follows:

Gametes	X^V	E^b
X^V	X^V X^V	X^V E^b
E^b	X^V E^b	X^b E^b

Answer 9

Expert Solution

Answer 10

Expert Solution

Answer 11

Expert Solution

Answer 12

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between vermilion females and brown males

Introduction:

The genes are the sequence of nucleotides that are present on the chromosomes and encode for a specific protein that plays a crucial role in the functioning of the different processes in an organism. The gene is located at specific gene loci and can be structural or regulatory in nature.

Answer 13

Explanation of Solution

The allele for vermillion trait can be expressed as (X^VX^V) and the allele for brown trait is (E^bE^b). The F1 progeny from cross between vermilion females and brown males will be as follows:

Gametes	X^V	X^V
E^b	X^VE^b	X^VE^b
E^b	X^V E^b	X^V E^b

The F2 progeny will be as follows:

Gametes	X^V	E^b
X^V	X^V X^V	X^V E^b
E^b	X^V E^b	X^b E^b

Answer 14

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism. The alleles are the contrasting forms of a gene and one of them is dominant and other is recessive

Explanation of Solution

The vermillion males can be expressed as (X^VY) and the brown females can be expressed as (E^bE^b). The progeny from the cross of vermilion males and brown females will be as follows:

Gametes	E^b	E^b
X^V	X^VE^b	X^VX^b
Y	E^b Y	E^b Y

The progeny obtained from the F2 cross will be

Gametes	E^b	Y
X^V	X^V E^b	X^VY
E^b	E^b E^b	E^b Y

Answer 15

Expert Solution

Answer 16

Expert Solution

Answer 17

Expert Solution

Answer 18

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The genotype is the genetic constitution of the organism while the phenotype is the external characters visible in an organism. The alleles are the contrasting forms of a gene and one of them is dominant and other is recessive

Answer 19

Explanation of Solution

The vermillion males can be expressed as (X^VY) and the brown females can be expressed as (E^bE^b). The progeny from the cross of vermilion males and brown females will be as follows:

Gametes	E^b	E^b
X^V	X^VE^b	X^VX^b
Y	E^b Y	E^b Y

The progeny obtained from the F2 cross will be

Gametes	E^b	Y
X^V	X^V E^b	X^VY
E^b	E^b E^b	E^b Y

Answer 20

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive phenotype is only expressed under homozygous condition.

Explanation of Solution

The scarlet females can be expressed through alleles (E^SE^S) and the brown males are expressed as (E^bE^b). The progeny from the cross of brown males and scarlet females will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Answer 21

Expert Solution

Answer 22

Expert Solution

Answer 23

Expert Solution

Answer 24

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and vermilion males

Introduction:

The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive phenotype is only expressed under homozygous condition.

Answer 25

Explanation of Solution

The scarlet females can be expressed through alleles (E^SE^S) and the brown males are expressed as (E^bE^b). The progeny from the cross of brown males and scarlet females will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Answer 26

Expert Solution

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and scarlet males

Introduction:

Fertilization is the process by which the male gamete, sperm, fertilize with the female gamete, ovary. The process brings about the fusion of two haploid pronuclei into a diploid zygote.

Explanation of Solution

The brown females can be seen as (E^bE^b) and scarlet males are represented as (E^SE^S). The progeny from the cross of brown females and scarlet males will be as follows:

Gametes	E^b	E^b
E^s	E^b E^s	E^b E^s
E^s	E^b E^s	E^b E^s

The progeny obtained from the F2 cross will be

Gametes	E^s	E^b
E^b	E^b E^s	E^b E^b
E^s	E^s E^s	E^b E^s

Answer 27

Expert Solution

Answer 28

Expert Solution

Answer 29

Expert Solution

Answer 30

Summary Introduction

To determine:

The F1 and F2 progeny from the cross between brown females and scarlet males

Introduction:

Fertilization is the process by which the male gamete, sperm, fertilize with the female gamete, ovary. The process brings about the fusion of two haploid pronuclei into a diploid zygote.

Answer 31

Explanation of Solution

The brown females can be seen as (E^bE^b) and scarlet males are represented as (E^SE^S). The progeny from the cross of brown females and scarlet males will be as follows: