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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An aberrant corn plant gives the following RF values when testcrossed: (The locus order is centromere-d–f–b–x–y–p.) The aberrant plant is a healthy plant, but it produces far fewer normal ovules and pollen than does the control plant. a. Propose a hypothesis to account for the abnormal recombination values and the reduced fertility in the aberrant plant. b. Use diagrams to explain the origin of the recombinants according to your hypothesis.

Consider a maize plant: Genotype C/cm ; Ac/Ac+ where cm is an unstable colorless allele caused by Ds insertion. What phenotypic ratios would be produced and in what proportions when this plant is crossed with a mutant c/c Ac+/Ac+? Assume that the Ac and c loci are unlinked, that the chromosome-breakage frequency is negligible, and the C allele encodes pigment production.

Consider the first category of test-cross offspring shown in figure 8.2 (+b, LS). Consider also that the parents of the heterozygous female flies in the test cross had the following genotypes: bb, SS, and +, LL. A. What would be the physical phenotype of these flies? B. If PC was conducted with the DNA of one of these flies using the primers for the molecular marker, what would be the appearance of the bands on an electrophoresis gel with the PC products? C. If the gene for black body and the locus for the molecular marker (L long or S short) were unlinked, what proportion of the test-cross progeny would be black flies that are heterozygous for the molecular marker? What proportion would be flies with normal body color, which are homozygous for one form of the molecular marker? D. If the gene for black body and the locus for the molecular marker were linked, how would the proportion of flies be different?

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 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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