Genetics: A Conceptual Approach
Genetics: A Conceptual Approach
6th Edition
ISBN: 9781319050962
Author: Benjamin A. Pierce
Publisher: W. H. Freeman
Question
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Chapter 7.2, Problem 22AQP

a.

Summary Introduction

To determine:

The phenotype and proportions of progeny produced by this crossing over (DOpdop×dopdop).

Introduction:

Phenotype is the actual description of all the observable characteristic of an organism that is obtained from its genotype. The phenotype includes: appearance, behavior and development. In the question following terms are used to denote genotype. (Tall =(D),Dwarf=(dd),Green=(Op),Opaque =(opop)).

a.

Expert Solution
Check Mark

Explanation of Solution

Pictorial representation:

The following figure represents the cross between (DOpdop×dopdop).

Genetics: A Conceptual Approach, Chapter 7.2, Problem 22AQP , additional homework tip  1

Fig. 1: The cross between (DOpdop×dopdop).

The cross in “Fig. 1” is between the homozygous recessive parent and heterozygous dominant parent. In this cross coupling will occur because of heterozygous dominant parent. In this two alleles are present on a same chromosome, so this lead to the production of four gametes.

Recombination frequency is 0.07 centiMorgan, so the parent frequency is (10.07)=0.93 centimorgan and for each parental gamete (0.932)=0.465, and for recombinant gamete (0.072)=0.035. In homozygous recessive parent neither coupling nor repulsion takes place because it will produce only one type of gamete with 100% recombination frequency.

b.

Summary Introduction

To determine:

The phenotype and proportions of progeny produced by this crossing over (DopdOp×dopdop)

Introduction:

Phenotype is the actual description of all the observable characteristic of an organism that is obtained from its genotype. The phenotype includes: appearance, behavior and development. In the question following terms are used to denote genotype. (Tall =(D),Dwarf=(dd),Green=(Op),Opaque =(opop)).

b.

Expert Solution
Check Mark

Explanation of Solution

Pictorial representation:

The following figure represents the cross between (DopdOp×dopdop)

Genetics: A Conceptual Approach, Chapter 7.2, Problem 22AQP , additional homework tip  2

Fig. 2: The cross between (DopdOp×dopdop)

The cross in “Fig. 2” is between the homozygous recessive parent and heterozygous dominant parent. In this cross repulsion will occur because of heterozygous dominant parent. In this one allele is dominant and one is recessive, and both are present on a same chromosome, so this lead to the production of four gametes.

Recombination frequency is 0.07 centiMorgan, so the parent frequency is (10.07)=0.93 centimorgan and for each parental gamete (0.932)=0.465, and for recombinant gamete (0.072)=0.035. In homozygous recessive parent neither coupling nor repulsion takes place because it will produce only one type of gamete with 100% recombination frequency.

c.

Summary Introduction

To determine:

The phenotype and proportions of progeny produced by this crossing over (DOpdop×DOpdop).

Introduction:

Phenotype is the actual description of all the observable characteristic of an organism that is obtained from its genotype. The phenotype includes: appearance, behavior and development. In the question following terms are used to denote genotype. (Tall =(D),Dwarf=(dd),Green=(Op),Opaque =(opop)).

c.

Expert Solution
Check Mark

Explanation of Solution

Pictorial representation:

The following figure represents the cross between. (DOpdop×DOpdop)

Genetics: A Conceptual Approach, Chapter 7.2, Problem 22AQP , additional homework tip  3

Fig. 3: The cross between. (DOpdop×DOpdop)

The cross in “Fig. 3” is between the heterozygous dominant parents, genotype will have dominant allele on one chromosome and recessive allele on other chromosomes. In this cross repulsion will occur because of heterozygous dominant parent. In this one allele is dominant and one is recessive, and both are present on a same chromosome, so this lead to the production of four gametes.

Recombination frequency is 0.07 centiMorgan, so the parent frequency is (10.07)=0.93 centimorgan and for each parental gamete (0.932)=0.465, and for recombinant gamete (0.072)=0.035.

d.

Summary Introduction

To determine:

The phenotype and proportions of progeny produced by this crossing over (DopdOp×DopdOp).

Introduction:

Phenotype is the actual description of all the observable characteristic of an organism that is obtained from its genotype. The phenotype includes: appearance, behavior and development. In the question following terms are used to denote genotype. (Tall =(D),Dwarf=(dd),Green=(Op),Opaque =(opop)).

d.

Expert Solution
Check Mark

Explanation of Solution

Pictorial representation: The following figure represents the cross between. (DopdOp×DopdOp)

Genetics: A Conceptual Approach, Chapter 7.2, Problem 22AQP , additional homework tip  4

Fig. 4: The cross between. (DopdOp×DopdOp)

The cross in “Fig.4” is between the heterozygous dominant parents. In this cross repulsion will occur because in this, genotype will have one dominant and one recessive allele on a chromosome, so this lead to the production of four gametes.

Recombination frequency is 0.07 centiMorgan, so the parent frequency is (10.07)=0.93 centimorgan and for each parental gamete (0.932)=0.465, and for recombinant gamete (0.072)=0.035.

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