The linkage relations of these two genes to their centromere. Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

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Answer 1

Question

Chapter 4, Problem 44P

a.

Summary Introduction

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

b.

Summary Introduction

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

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A yeast geneticist irradiates haploid cells of a strain thatis an adenine-requiring auxotrophic mutant, caused bymutation of the gene ade1. Millions of the irradiatedcells are plated on minimal medium, and a small number of cells divide and produce prototrophic colonies.These colonies are crossed individually with a wildtype strain. Two types of results are obtained:(1) prototroph × wild type : progeny all prototrophic(2) prototroph × wild type : progeny 75% prototrophic,25% adenine-requiring auxotrophsa. Explain the difference between these two types ofresults.b. Write the genotypes of the prototrophs in each case.c. What progeny phenotypes and ratios do you predictfrom crossing a prototroph of type 2 by the original ade1auxotroph?

A yeast geneticist irradiates haploid cells of a strain that is an adenine-requiring auxotrophic mutant, caused by mutation of the gene ade1. Millions of the irradiated cells are plated on minimal medium, and a small number of cells divide and produce prototrophic colonies. These colonies are crossed individually with a wildtype strain. Two types of results are obtained:(1) prototroph × wild type : progeny all prototrophic(2) prototroph × wild type : progeny 75% prototrophic, 25% adenine-requiring auxotrophsa. Explain the difference between these two types of results.b. Write the genotypes of the prototrophs in each case.c. What progeny phenotypes and ratios do you predict from crossing a prototroph of type 2 by the original ade1auxotroph?

The following results are derived from crosses between Neurospora strain xy and strain ++: Tetrad Class 3 4 ху x+ x+ xy ++ ++ ++ +y +y ху +y 25 ++ 3 124 4 (i) Name the ascus type of each class from 1 to 4 as P, NP or T. (ii) Are genes x and y linked? Explain your answer. (iii) If they are linked, determine the map distance between the two genes. If they are unlinked, provide all the information you can about why you draw this conclusion.

Answer 2

Question

Chapter 4, Problem 44P

a.

Summary Introduction

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

b.

Summary Introduction

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

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Answer 3

Question

Chapter 4, Problem 44P

a.

Summary Introduction

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

b.

Summary Introduction

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

Expert Solution & Answer

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Answer 4

Question

Chapter 4, Problem 44P

a.

Summary Introduction

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

b.

Summary Introduction

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

Expert Solution & Answer

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Answer 5

Chapter 4, Problem 44P

a.

Summary Introduction

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

b.

Summary Introduction

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

Answer 6

Chapter 4, Problem 44P

a.

Summary Introduction

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

Answer 7

Chapter 4, Problem 44P

a.

Summary Introduction

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

Answer 8

b.

Summary Introduction

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

Answer 9

b.

Summary Introduction

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 4 - Prob. 1P Ch. 4 - Prob. 5P Ch. 4 - Prob. 12P Ch. 4 - Prob. 13P Ch. 4 - Prob. 14P Ch. 4 - Prob. 15P Ch. 4 - Prob. 16P Ch. 4 - Prob. 17P Ch. 4 - Prob. 18P Ch. 4 - Prob. 19P

The linkage relations of these two genes to their centromere. Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

Solution Summary: The author illustrates the linkage relations of two non-allelic GENES to their centromere.

Concept explainers

Videos

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

Want to see the full answer?

Chapter 4 Solutions

The linkage relations of these two genes to their centromere. Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

Solution Summary: The author illustrates the linkage relations of two non-allelic GENES to their centromere.

Concept explainers

Videos

To determine: The linkage relations of these two genes to their centromere. Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

To determine: A diagram to show the origin of the ascus type with only one single representative. Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.

Want to see the full answer?

Chapter 4 Solutions

To determine: The linkage relations of these two genes to their centromere.

Introduction: The association in inheritance of two or more non-allelic GENES due to their being located more or less closely on the same chromosome is called a chromosome.

To determine: A diagram to show the origin of the ascus type with only one single representative.

Introduction: Linked genes are genes that are so physically close to each other that it is rare for a homologous recombination event to separate them. Thus their alleles tend to be co-inherited.