The presence of linkage between genes in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b. Introduction: A cross between a triple heterozygote parent and a homozygous recessive tester with triply recessive alleles is called a three-point testcross. With the help of a three-point testcross, one can determine the linkage between three or more genes and gene order.

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Answer 1

Question

Chapter 4, Problem 21P

a.

Summary Introduction

To determine: The presence of linkage between genes in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: A cross between a triple heterozygote parent and a homozygous recessive tester with triply recessive alleles is called a three-point testcross. With the help of a three-point testcross, one can determine the linkage between three or more genes and gene order.

b.

Summary Introduction

To Draw: A genetic map showing distances between p, v, and b genes in map units.

Introduction: The map unit (m.u.) also referred to as a centimorgan (cM) helps to evaluate the physical distances between genes that are located on the same chromosomes (genetic linkage). The two loci with 1% of recombination explain that they are 1 map unit apart on a genetic map.

c.

Summary Introduction

To determine: The interference in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: The crossovers hinder each other in an interaction known as interference. The gene interference determines whether crossovers are dependent or independent from each other. It is determined by calculating the coefficient of coincidence (c.o.c.). As, the interference = 1 - coefficient of coincidence (c.o.c.).

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Answer 2

Question

Chapter 4, Problem 21P

a.

Summary Introduction

To determine: The presence of linkage between genes in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: A cross between a triple heterozygote parent and a homozygous recessive tester with triply recessive alleles is called a three-point testcross. With the help of a three-point testcross, one can determine the linkage between three or more genes and gene order.

b.

Summary Introduction

To Draw: A genetic map showing distances between p, v, and b genes in map units.

Introduction: The map unit (m.u.) also referred to as a centimorgan (cM) helps to evaluate the physical distances between genes that are located on the same chromosomes (genetic linkage). The two loci with 1% of recombination explain that they are 1 map unit apart on a genetic map.

c.

Summary Introduction

To determine: The interference in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: The crossovers hinder each other in an interaction known as interference. The gene interference determines whether crossovers are dependent or independent from each other. It is determined by calculating the coefficient of coincidence (c.o.c.). As, the interference = 1 - coefficient of coincidence (c.o.c.).

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Answer 3

Question

Chapter 4, Problem 21P

a.

Summary Introduction

To determine: The presence of linkage between genes in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: A cross between a triple heterozygote parent and a homozygous recessive tester with triply recessive alleles is called a three-point testcross. With the help of a three-point testcross, one can determine the linkage between three or more genes and gene order.

b.

Summary Introduction

To Draw: A genetic map showing distances between p, v, and b genes in map units.

Introduction: The map unit (m.u.) also referred to as a centimorgan (cM) helps to evaluate the physical distances between genes that are located on the same chromosomes (genetic linkage). The two loci with 1% of recombination explain that they are 1 map unit apart on a genetic map.

c.

Summary Introduction

To determine: The interference in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: The crossovers hinder each other in an interaction known as interference. The gene interference determines whether crossovers are dependent or independent from each other. It is determined by calculating the coefficient of coincidence (c.o.c.). As, the interference = 1 - coefficient of coincidence (c.o.c.).

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Answer 4

Question

Chapter 4, Problem 21P

a.

Summary Introduction

To determine: The presence of linkage between genes in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: A cross between a triple heterozygote parent and a homozygous recessive tester with triply recessive alleles is called a three-point testcross. With the help of a three-point testcross, one can determine the linkage between three or more genes and gene order.

b.

Summary Introduction

To Draw: A genetic map showing distances between p, v, and b genes in map units.

Introduction: The map unit (m.u.) also referred to as a centimorgan (cM) helps to evaluate the physical distances between genes that are located on the same chromosomes (genetic linkage). The two loci with 1% of recombination explain that they are 1 map unit apart on a genetic map.

c.

Summary Introduction

To determine: The interference in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: The crossovers hinder each other in an interaction known as interference. The gene interference determines whether crossovers are dependent or independent from each other. It is determined by calculating the coefficient of coincidence (c.o.c.). As, the interference = 1 - coefficient of coincidence (c.o.c.).

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Answer 5

Chapter 4, Problem 21P

a.

Summary Introduction

To determine: The presence of linkage between genes in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: A cross between a triple heterozygote parent and a homozygous recessive tester with triply recessive alleles is called a three-point testcross. With the help of a three-point testcross, one can determine the linkage between three or more genes and gene order.

b.

Summary Introduction

To Draw: A genetic map showing distances between p, v, and b genes in map units.

Introduction: The map unit (m.u.) also referred to as a centimorgan (cM) helps to evaluate the physical distances between genes that are located on the same chromosomes (genetic linkage). The two loci with 1% of recombination explain that they are 1 map unit apart on a genetic map.

c.

Summary Introduction

To determine: The interference in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: The crossovers hinder each other in an interaction known as interference. The gene interference determines whether crossovers are dependent or independent from each other. It is determined by calculating the coefficient of coincidence (c.o.c.). As, the interference = 1 - coefficient of coincidence (c.o.c.).

Answer 6

Chapter 4, Problem 21P

a.

Summary Introduction

To determine: The presence of linkage between genes in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: A cross between a triple heterozygote parent and a homozygous recessive tester with triply recessive alleles is called a three-point testcross. With the help of a three-point testcross, one can determine the linkage between three or more genes and gene order.

Answer 7

Chapter 4, Problem 21P

a.

Summary Introduction

To determine: The presence of linkage between genes in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: A cross between a triple heterozygote parent and a homozygous recessive tester with triply recessive alleles is called a three-point testcross. With the help of a three-point testcross, one can determine the linkage between three or more genes and gene order.

Answer 8

b.

Summary Introduction

To Draw: A genetic map showing distances between p, v, and b genes in map units.

Introduction: The map unit (m.u.) also referred to as a centimorgan (cM) helps to evaluate the physical distances between genes that are located on the same chromosomes (genetic linkage). The two loci with 1% of recombination explain that they are 1 map unit apart on a genetic map.

Answer 9

b.

Summary Introduction

To Draw: A genetic map showing distances between p, v, and b genes in map units.

Introduction: The map unit (m.u.) also referred to as a centimorgan (cM) helps to evaluate the physical distances between genes that are located on the same chromosomes (genetic linkage). The two loci with 1% of recombination explain that they are 1 map unit apart on a genetic map.

Answer 10

c.

Summary Introduction

To determine: The interference in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: The crossovers hinder each other in an interaction known as interference. The gene interference determines whether crossovers are dependent or independent from each other. It is determined by calculating the coefficient of coincidence (c.o.c.). As, the interference = 1 - coefficient of coincidence (c.o.c.).

Answer 11

c.

Summary Introduction

To determine: The interference in a three-point cross between the parental genotypes +/+ · +/+ · +/+ x p/p· v/v · b/b.

Introduction: The crossovers hinder each other in an interaction known as interference. The gene interference determines whether crossovers are dependent or independent from each other. It is determined by calculating the coefficient of coincidence (c.o.c.). As, the interference = 1 - coefficient of coincidence (c.o.c.).

Answer 12

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Answer 13

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Answer 14

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Answer 15

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

Solution Summary: The author explains how a three-point testcross determines the linkage between three or more genes and gene order.

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