a. To determine: The explanation for the obtained result and the genotypes of the two parental strains. Introduction: Genes are responsible for passing phenotypic as well as genotypic traits from one generation to another generation. Genes show different types of interactions between them. These gene interactions are capable of affecting the expression of the phenotypic character of one or the other gene.

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Answer 1

Question

Chapter 3, Problem 21P

Summary Introduction

a.

To determine:

The explanation for the obtained result and the genotypes of the two parental strains.

Introduction:

Genes are responsible for passing phenotypic as well as genotypic traits from one generation to another generation. Genes show different types of interactions between them. These gene interactions are capable of affecting the expression of the phenotypic character of one or the other gene.

Summary Introduction

b.

To determine:

The phenotypes along with their frequencies of the progenies obtained from the testcross of F₁ plants.

Introduction:

Test cross involves breeding of an individual having some unknown genotype with an individual that is homozygous recessive genotypically. Based on the ratio of the obtained progenies, the genotype of the unknown individual can be determined.

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In an autotetraploid Chinese primrose (Primula sinensis), the gene controlling stigma color is very near the centromere of the chromosome carrying it. The allele G for green stigma is dominant to g for red stigmas. A homozygous green autotetraploid strain is crossed with a homozygous red autotetraploid strain. a. What is the genotype of the F1? b. Show the types of gametes the F1’s may be expected to form and derive the expected proportion of each. c. What phenotypic ratio of green to red is expected if: 1. The F1’s are intercrossed? 2. The F1’s are crossed with red plants d. If the G locus were 50 or more map units from the centromere, what types and proportions of gametes would the F1 be expected to produce? Derive the expected F2 phenotypic ratio.

In autotetraploid Chinese primrose (Primula sinensis L.), the gene controlling stigma color is very near the centromere of the chromosome carrying it. The allele G for green stigma is dominant to g for red stigmas. A homozygous green autotetraploid strain is crossed with a homozygous red autotetraploid strain. a. What is the genotype of the Fl1? b. Show the types of gametes the Fl's may be expected to form and derive the expected proportion of each. Show your solution. c. What phenotypic ratio of green to red is expected if: the Fl's are intercrossed? Show your solution. the Fl's are crossed with red plants? Show your solution. d. If the G locus were 50 or more map units from the centromere, what types and proportions of gametes would the Fl be expected to produce? Derive the expected F2 phenotypic ratio.

shows the results of a dihybrid cross involving seed shape and seed color. a. What proportion of the round and yellow F2 progeny from this cross is homozygous at both loci? b. What proportion of the round and yellow F2 progeny from this cross is homozygous at least at one locus?

Answer 2

Question

Chapter 3, Problem 21P

Summary Introduction

a.

To determine:

The explanation for the obtained result and the genotypes of the two parental strains.

Introduction:

Genes are responsible for passing phenotypic as well as genotypic traits from one generation to another generation. Genes show different types of interactions between them. These gene interactions are capable of affecting the expression of the phenotypic character of one or the other gene.

Summary Introduction

b.

To determine:

The phenotypes along with their frequencies of the progenies obtained from the testcross of F₁ plants.

Introduction:

Test cross involves breeding of an individual having some unknown genotype with an individual that is homozygous recessive genotypically. Based on the ratio of the obtained progenies, the genotype of the unknown individual can be determined.

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Answer 3

Question

Chapter 3, Problem 21P

Summary Introduction

a.

To determine:

The explanation for the obtained result and the genotypes of the two parental strains.

Introduction:

Genes are responsible for passing phenotypic as well as genotypic traits from one generation to another generation. Genes show different types of interactions between them. These gene interactions are capable of affecting the expression of the phenotypic character of one or the other gene.

Summary Introduction

b.

To determine:

The phenotypes along with their frequencies of the progenies obtained from the testcross of F₁ plants.

Introduction:

Test cross involves breeding of an individual having some unknown genotype with an individual that is homozygous recessive genotypically. Based on the ratio of the obtained progenies, the genotype of the unknown individual can be determined.

Expert Solution & Answer

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See solution

Answer 4

Question

Chapter 3, Problem 21P

Summary Introduction

a.

To determine:

The explanation for the obtained result and the genotypes of the two parental strains.

Introduction:

Genes are responsible for passing phenotypic as well as genotypic traits from one generation to another generation. Genes show different types of interactions between them. These gene interactions are capable of affecting the expression of the phenotypic character of one or the other gene.

Summary Introduction

b.

To determine:

The phenotypes along with their frequencies of the progenies obtained from the testcross of F₁ plants.

Introduction:

Test cross involves breeding of an individual having some unknown genotype with an individual that is homozygous recessive genotypically. Based on the ratio of the obtained progenies, the genotype of the unknown individual can be determined.

Expert Solution & Answer

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Answer 5

Chapter 3, Problem 21P

Summary Introduction

a.

To determine:

The explanation for the obtained result and the genotypes of the two parental strains.

Introduction:

Genes are responsible for passing phenotypic as well as genotypic traits from one generation to another generation. Genes show different types of interactions between them. These gene interactions are capable of affecting the expression of the phenotypic character of one or the other gene.

Summary Introduction

b.

To determine:

The phenotypes along with their frequencies of the progenies obtained from the testcross of F₁ plants.

Introduction:

Test cross involves breeding of an individual having some unknown genotype with an individual that is homozygous recessive genotypically. Based on the ratio of the obtained progenies, the genotype of the unknown individual can be determined.

Answer 6

Chapter 3, Problem 21P

Summary Introduction

a.

To determine:

The explanation for the obtained result and the genotypes of the two parental strains.

Introduction:

Genes are responsible for passing phenotypic as well as genotypic traits from one generation to another generation. Genes show different types of interactions between them. These gene interactions are capable of affecting the expression of the phenotypic character of one or the other gene.

Answer 7

Chapter 3, Problem 21P

Summary Introduction

a.

To determine:

The explanation for the obtained result and the genotypes of the two parental strains.

Introduction:

Genes are responsible for passing phenotypic as well as genotypic traits from one generation to another generation. Genes show different types of interactions between them. These gene interactions are capable of affecting the expression of the phenotypic character of one or the other gene.

Answer 8

Summary Introduction

b.

To determine:

The phenotypes along with their frequencies of the progenies obtained from the testcross of F₁ plants.

Introduction:

Test cross involves breeding of an individual having some unknown genotype with an individual that is homozygous recessive genotypically. Based on the ratio of the obtained progenies, the genotype of the unknown individual can be determined.

Answer 9

Summary Introduction

b.

To determine:

The phenotypes along with their frequencies of the progenies obtained from the testcross of F₁ plants.

Introduction:

Test cross involves breeding of an individual having some unknown genotype with an individual that is homozygous recessive genotypically. Based on the ratio of the obtained progenies, the genotype of the unknown individual can be determined.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 3 - For each of the terms in the left column, choose...Ch. 3 - In four-oclocks, the allele for red flowers is...Ch. 3 - The Aa heterozygous snapdragons in Fig. 3.3 are...Ch. 3 - In the fruit fly Drosophila melanogaster, very...Ch. 3 - A cross between two plants that both have yellow...Ch. 3 - In radishes, color and shape are each controlled...Ch. 3 - A wild legume with white flowers and long pods is...Ch. 3 - Prob. 8P Ch. 3 - Assuming no involvement of the Bombay phenotype:...Ch. 3 - Several genes in humans in addition to the ABO...

Solution Summary: The author explains that genes are responsible for passing phenotypic as well as genotypic traits from one generation to another. Testcross involves breeding of an individual with a homozygous recessive genotype.

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