The appearance of the F1. Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

Question

In the model plant Arabidopsis thaliana, the following alleles were used in a cross: T = presence of trichomes t = absence of trichomes D = tall plants d = dwarf plants W = waxy cuticle w = nonwaxy A = presence of purple anthocyanin pigment a = absence (white) The T/t and D/d loci are linked 26 m.u. apart on chromosome 1, whereas the W/w and A/a loci are linked 8 m.u. apart on chromosome 2. A pure-breeding double-homozygous recessive trichomeless nonwaxy plant is crossed with another pure-breeding double-homozygous recessive dwarf white plant. a. What will be the appearance of the F1? b. Sketch the chromosomes 1 and 2 of the parents and the F1, showing the arrangement of the alleles.c. If the F1 is testcrossed, what proportion of the progeny will have all four recessive phenotypes?

Answer 1

Question

Chapter 4, Problem 46P

a.

Summary Introduction

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

b.

Summary Introduction

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

c.

Summary Introduction

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

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In the model plant Arabidopsis thaliana, the following alleles were used in a cross: T = presence of trichomes t = absence of trichomes D = tall plants d = dwarf plants W = waxy cuticle w = nonwaxy A = presence of purple anthocyanin pigment a = absence (white) The T/t and D/d loci are linked 26 m.u. apart on chromosome 1, whereas the W/w and A/a loci are linked 8 m.u. apart on chromosome 2. A pure-breeding double-homozygous recessive trichomeless nonwaxy plant is crossed with another pure-breeding double-homozygous recessive dwarf white plant. a. What will be the appearance of the F1? b. Sketch the chromosomes 1 and 2 of the parents and the F1, showing the arrangement of the alleles.c. If the F1 is testcrossed, what proportion of the progeny will have all four recessive phenotypes?

. In common wheat, Triticum aestivum, kernel color is determined by multiply duplicated genes, each with an Rand an r allele. Any number of R alleles will give red, anda complete lack of R alleles will give the white phenotype.In one cross between a red pure line and a white pureline, the F2 was 6463 red and 641 white.a. How many R genes are segregating in this system?b. Show the genotypes of the parents, the F1, and the F2.c. Different F2 plants are backcrossed with the whiteparent. Give examples of genotypes that would give thefollowing progeny ratios in such backcrosses: (1) 1 red :1 white, (2) 3 red :1 white, (3) 7 red :1 white.d. What is the formula that generally relates thenumber of segregating genes to the proportion of redindividuals in the F2 in such systems?

In fruit flies, you are mapping three genes in a three point cross. The mutants are hairy body (h), sepia colored eyes (se) and female sterility (g). You cross a heterozygous parent with a homozygous recessive parent and obtain the following results: Type Number h se g. 5 + se + 450 + se g 27 ++g_ h se + + + + h + g. h + + TOTAL is the gene in the middle and the distance in map units between se and g is Oh; 16.4 se; 7.1 Oh; 7.1 70 82 7 327 32 1000 se; 16.4

Answer 2

Question

Chapter 4, Problem 46P

a.

Summary Introduction

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

b.

Summary Introduction

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

c.

Summary Introduction

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

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Answer 3

Question

Chapter 4, Problem 46P

a.

Summary Introduction

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

b.

Summary Introduction

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

c.

Summary Introduction

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

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Answer 4

Question

Chapter 4, Problem 46P

a.

Summary Introduction

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

b.

Summary Introduction

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

c.

Summary Introduction

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

Expert Solution & Answer

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Answer 5

Chapter 4, Problem 46P

a.

Summary Introduction

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

b.

Summary Introduction

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

c.

Summary Introduction

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

Answer 6

Chapter 4, Problem 46P

a.

Summary Introduction

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

Answer 7

Chapter 4, Problem 46P

a.

Summary Introduction

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

Answer 8

b.

Summary Introduction

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

Answer 9

b.

Summary Introduction

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

Answer 10

c.

Summary Introduction

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

Answer 11

c.

Summary Introduction

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

Answer 12

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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 appearance of the F1. Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

Solution Summary: The author explains the phenomenon of dominance in a recessive allele remains obscure in the hybrid.

Concept explainers

Videos

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

Chapter 4 Solutions

The appearance of the F1. Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

Solution Summary: The author explains the phenomenon of dominance in a recessive allele remains obscure in the hybrid.

Concept explainers

Videos

To determine: The appearance of the F1. Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

To determine: The proportion of the progeny that will have all four recessive phenotypes. Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.

Chapter 4 Solutions

To determine: The appearance of the F1.

Introduction: Dominance is the phenomenon of one variant of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome.

To determine: The chromosomes 1 and 2 of the parents and the F1 and the arrangement of the alleles

Introduction: Autosomal dominant phenotypes are slightly less severe and demonstrate widely variable expressivity and incomplete penetrances.

To determine: The proportion of the progeny that will have all four recessive phenotypes.

Introduction: The phenomenon of dominance in a recessive allele remains obscure in the hybrid.