Genetics: From Genes to Genomes
Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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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
Check Mark
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 (XVXV) and the allele for brown trait is (EbEb). The F1 progeny from cross between vermilion females and brown males will be as follows:

Gametes XV XV
Eb XV Eb XV Eb
Eb XV Eb XV Eb

The F2 progeny will be as follows:

Gametes XV Eb
XV XV XV XV Eb
Eb XV Eb Xb Eb
Expert Solution
Check Mark
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 (XVY) and the brown females can be expressed as (Eb Eb). The progeny from the cross of vermilion males and brown females will be as follows:

Gametes Eb Eb
XV XV Eb XV Xb
Y Eb Y Eb Y

The progeny obtained from the F2 cross will be

Gametes Eb Y
XV XV Eb XVY
Eb Eb Eb Eb Y
Expert Solution
Check Mark
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 (ESES) and the brown males are expressed as (EbEb). The progeny from the cross of brown males and scarlet females will be as follows:

Gametes Eb Eb
Es Eb Es Eb Es
Es Eb Es Eb Es

The progeny obtained from the F2 cross will be

Gametes Es Eb
Eb Eb Es Eb Eb
Es Es Es Eb Es
Expert Solution
Check Mark
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 (EbEb) and scarlet males are represented as (ESES). The progeny from the cross of brown females and scarlet males will be as follows:

Gametes Eb Eb
Es Eb Es Eb Es
Es Eb Es Eb Es

The progeny obtained from the F2 cross will be

Gametes Es Eb
Eb Eb Es Eb Eb
Es Es Es Eb Es

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Chapter 4 Solutions

Genetics: From Genes to Genomes

Ch. 4 - One oak tree cell with 14 chromosomes undergoes...Ch. 4 - Which types of cell division mitosis, meiosis I,...Ch. 4 - Complete the following statements using as many of...Ch. 4 - The five cells shown in figure a e are all from...Ch. 4 - One of the first microscopic observations of...Ch. 4 - A person is simultaneously heterozygous for two...Ch. 4 - Assuming i that the two chromosomes in every...Ch. 4 - In the moss Polytrichum commune, the haploid...Ch. 4 - Can you think of anything that would prevent...Ch. 4 - Sister chromatids are held together through...Ch. 4 - The pseudoautosomal regions PARs of the X and Y...Ch. 4 - Remarkably, the platypus has 10 sex chromosomes,...Ch. 4 - Somatic cells of chimpanzees contain 48...Ch. 4 - In humans: a. How many sperm develop from 100...Ch. 4 - Women sometimes develop benign tumors called...Ch. 4 - In a certain strain of turkeys, unfertilized eggs...Ch. 4 - Imagine you have two pure-breeding lines of...Ch. 4 - A system of sex determination known as...Ch. 4 - In Drosophila, the autosomal recessive brown eye...Ch. 4 - Barred feather pattern is a Z-linked dominant...Ch. 4 - When Calvin Bridges observed a large number of...Ch. 4 - In a vial of Drosophila, a research student...Ch. 4 - In 1919, Calvin Bridges began studying an X-linked...Ch. 4 - In Drosophila, a cross was made between a...Ch. 4 - As we learned in this chapter, the white mutation...Ch. 4 - The following is a pedigree of a family in which a...Ch. 4 - Each of the four pedigrees that follow represents...Ch. 4 - The pedigree that follows indicates the occurrence...Ch. 4 - Duchenne muscular dystrophy DMD is caused by a...Ch. 4 - The X-linked gene responsible for DMD encodes a...Ch. 4 - Males have hemophilia when they are hemizygous for...Ch. 4 - In the Fast Forward Box Visualizing X Chromosome...Ch. 4 - Consider the following pedigrees from human...Ch. 4 - Several different antigens can be detected in...Ch. 4 - The ancestry of a white female tiger bred in a...Ch. 4 - The pedigree that follows shows the inheritance of...Ch. 4 - In 1995, doctors reported a Chinese family in...Ch. 4 - In cats, the dominant O allele of the X-linked...Ch. 4 - In marsupials like the opposum or kangaroo, X...Ch. 4 - The pedigree diagram below shows a family in which...
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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY