The linkage in the three loci and their map distances. . Introduction. Linkage is the phenomenon in which two or more genes are linked to each other being present very close to each other on the chromosome. This causes the genes to prevent crossing over and pass on as wild state from parent to offspring.

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Answer 1

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Chapter 4, Problem 31P

a.

Summary Introduction

To determine: The linkage in the three loci and their map distances. .

Introduction. Linkage is the phenomenon in which two or more genes are linked to each other being present very close to each other on the chromosome. This causes the genes to prevent crossing over and pass on as wild state from parent to offspring.

b.

Summary Introduction

To determine: The allele arrangement on the chromosomes of the triple heterozygote used in the testcross.

Introduction. Recombination is the process that is exclusive to the meiotic division as it allows the exchange of genetic material between the non-homologous chromosomes. The recombination process is responsible for the shuffling of the characters and producing a zygote that is different from both the parents but have the chromosomes from both the parents.

c.

Summary Introduction

To determine: The value of interference.

Introduction: The law of independent assortment was given in a dihybrid cross which is the cross between the alleles of two pairs of contrasting characters. The alleles produced by each character are independent to combine with the alleles of the other character. This independent sorting of the alleles irrespective of the dominant or the recessive trait is defined as the law of independent assortment.

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In corn, the allele f ′ causes floury endosperm and the allele f ″ causes flinty endosperm. In the cross f ′/f ′ ×f ″/f ″, all the progeny endosperms are floury, but, in the reciprocal cross, all the progeny endosperms are flinty. What is a possible explanation? (Check the legend for Figure 2-7.)

A snapdragon with pink petals, black anthers, and longstems was allowed to self-fertilize. From the resultingseeds, 650 adult plants were obtained. The phenotypesof these offspring are listed here.78 red long tan26 red short tan44 red long black15 red short black39 pink long tan13 pink short tan204 pink long black68 pink short black5 white long tan2 white short tan117 white long black39 white short blacka. Using P for one allele and p for the other, indicatehow flower color is inherited.b. What numbers of red : pink : white would havebeen expected among these 650 plants?c. How are anther color and stem length inherited?d. What was the genotype of the original plant?e. Do any of the three genes show independentassortment?f. For any genes that are linked, indicate the arrangements of the alleles on the homologous chromosomes in the original snapdragon, and estimate thedistance between the genes

Waxy endosperm (wx), shrunken endosperm (sh) and yellow seedling (v) are encoded by three recessive genes in corn that are linked on chromosome 5. A corn plant homozygous for all three recessive alleles is crossed with a plant homozygous for all the dominant alleles. The resulting F1 are then crossed with a plant homozygous for the recessive alleles in a three point test cross. The progeny of the test cross are: wx sh WX SH V WX SH V Wx sh WX sh V SH v SH V V 87 1,515 94 WX 1,531 3,479 292 WX Wx sh v 3,478 280 a. Determine the order of the genes on the chromosome. b. Calculate the map distances between the genes. c. Determine the cc and I.

Answer 2

Question

Chapter 4, Problem 31P

a.

Summary Introduction

To determine: The linkage in the three loci and their map distances. .

Introduction. Linkage is the phenomenon in which two or more genes are linked to each other being present very close to each other on the chromosome. This causes the genes to prevent crossing over and pass on as wild state from parent to offspring.

b.

Summary Introduction

To determine: The allele arrangement on the chromosomes of the triple heterozygote used in the testcross.

Introduction. Recombination is the process that is exclusive to the meiotic division as it allows the exchange of genetic material between the non-homologous chromosomes. The recombination process is responsible for the shuffling of the characters and producing a zygote that is different from both the parents but have the chromosomes from both the parents.

c.

Summary Introduction

To determine: The value of interference.

Introduction: The law of independent assortment was given in a dihybrid cross which is the cross between the alleles of two pairs of contrasting characters. The alleles produced by each character are independent to combine with the alleles of the other character. This independent sorting of the alleles irrespective of the dominant or the recessive trait is defined as the law of independent assortment.

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Answer 3

Question

Chapter 4, Problem 31P

a.

Summary Introduction

To determine: The linkage in the three loci and their map distances. .

Introduction. Linkage is the phenomenon in which two or more genes are linked to each other being present very close to each other on the chromosome. This causes the genes to prevent crossing over and pass on as wild state from parent to offspring.

b.

Summary Introduction

To determine: The allele arrangement on the chromosomes of the triple heterozygote used in the testcross.

Introduction. Recombination is the process that is exclusive to the meiotic division as it allows the exchange of genetic material between the non-homologous chromosomes. The recombination process is responsible for the shuffling of the characters and producing a zygote that is different from both the parents but have the chromosomes from both the parents.

c.

Summary Introduction

To determine: The value of interference.

Introduction: The law of independent assortment was given in a dihybrid cross which is the cross between the alleles of two pairs of contrasting characters. The alleles produced by each character are independent to combine with the alleles of the other character. This independent sorting of the alleles irrespective of the dominant or the recessive trait is defined as the law of independent assortment.

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Answer 4

Question

Chapter 4, Problem 31P

a.

Summary Introduction

To determine: The linkage in the three loci and their map distances. .

Introduction. Linkage is the phenomenon in which two or more genes are linked to each other being present very close to each other on the chromosome. This causes the genes to prevent crossing over and pass on as wild state from parent to offspring.

b.

Summary Introduction

To determine: The allele arrangement on the chromosomes of the triple heterozygote used in the testcross.

Introduction. Recombination is the process that is exclusive to the meiotic division as it allows the exchange of genetic material between the non-homologous chromosomes. The recombination process is responsible for the shuffling of the characters and producing a zygote that is different from both the parents but have the chromosomes from both the parents.

c.

Summary Introduction

To determine: The value of interference.

Introduction: The law of independent assortment was given in a dihybrid cross which is the cross between the alleles of two pairs of contrasting characters. The alleles produced by each character are independent to combine with the alleles of the other character. This independent sorting of the alleles irrespective of the dominant or the recessive trait is defined as the law of independent assortment.

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Answer 5

Chapter 4, Problem 31P

a.

Summary Introduction

To determine: The linkage in the three loci and their map distances. .

Introduction. Linkage is the phenomenon in which two or more genes are linked to each other being present very close to each other on the chromosome. This causes the genes to prevent crossing over and pass on as wild state from parent to offspring.

b.

Summary Introduction

To determine: The allele arrangement on the chromosomes of the triple heterozygote used in the testcross.

Introduction. Recombination is the process that is exclusive to the meiotic division as it allows the exchange of genetic material between the non-homologous chromosomes. The recombination process is responsible for the shuffling of the characters and producing a zygote that is different from both the parents but have the chromosomes from both the parents.

c.

Summary Introduction

To determine: The value of interference.

Introduction: The law of independent assortment was given in a dihybrid cross which is the cross between the alleles of two pairs of contrasting characters. The alleles produced by each character are independent to combine with the alleles of the other character. This independent sorting of the alleles irrespective of the dominant or the recessive trait is defined as the law of independent assortment.

Answer 6

Chapter 4, Problem 31P

a.

Summary Introduction

To determine: The linkage in the three loci and their map distances. .

Introduction. Linkage is the phenomenon in which two or more genes are linked to each other being present very close to each other on the chromosome. This causes the genes to prevent crossing over and pass on as wild state from parent to offspring.

Answer 7

Chapter 4, Problem 31P

a.

Summary Introduction

To determine: The linkage in the three loci and their map distances. .

Introduction. Linkage is the phenomenon in which two or more genes are linked to each other being present very close to each other on the chromosome. This causes the genes to prevent crossing over and pass on as wild state from parent to offspring.

Answer 8

b.

Summary Introduction

To determine: The allele arrangement on the chromosomes of the triple heterozygote used in the testcross.

Introduction. Recombination is the process that is exclusive to the meiotic division as it allows the exchange of genetic material between the non-homologous chromosomes. The recombination process is responsible for the shuffling of the characters and producing a zygote that is different from both the parents but have the chromosomes from both the parents.

Answer 9

b.

Summary Introduction

To determine: The allele arrangement on the chromosomes of the triple heterozygote used in the testcross.

Introduction. Recombination is the process that is exclusive to the meiotic division as it allows the exchange of genetic material between the non-homologous chromosomes. The recombination process is responsible for the shuffling of the characters and producing a zygote that is different from both the parents but have the chromosomes from both the parents.

Answer 10

c.

Summary Introduction

To determine: The value of interference.

Introduction: The law of independent assortment was given in a dihybrid cross which is the cross between the alleles of two pairs of contrasting characters. The alleles produced by each character are independent to combine with the alleles of the other character. This independent sorting of the alleles irrespective of the dominant or the recessive trait is defined as the law of independent assortment.

Answer 11

c.

Summary Introduction

To determine: The value of interference.

Introduction: The law of independent assortment was given in a dihybrid cross which is the cross between the alleles of two pairs of contrasting characters. The alleles produced by each character are independent to combine with the alleles of the other character. This independent sorting of the alleles irrespective of the dominant or the recessive trait is defined as the law of independent assortment.

Answer 12

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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 the law of independent assortment in a dihybrid cross, which is the cross between the alleles of two pairs of contrasting characters.

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