The linked genes from the data and the distance between them in map units. Introduction: Linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern. These genes have the short distance in them in map units, thereby they get inherited as a unit and they do not segregate separately. The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows: Cross I: Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings. Offspring results: 131 Red-eye color, Normal wings 120 Sepia eye color, Vestigial wings 122 Red-eye color, Vestigial wings 127 Sepia eye color, Normal wings Cross II: Parents: Heterozygous gray body, normal wings × black body color, vestigial wings. Offspring results: 236 Gray body, normal wings. 253 Black body, Vestigial wings. 50 Gray body, Vestigial wings. 61 Black body, Normal wings.

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Answer 1

Question

Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

Chapter 12.4, Problem 6R

Summary Introduction

To review:

The linked genes from the data and the distance between them in map units.

Introduction:

Linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern. These genes have the short distance in them in map units, thereby they get inherited as a unit and they do not segregate separately.

The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows:

Cross I:

Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings.

Offspring results:

131 Red-eye color, Normal wings

120 Sepia eye color, Vestigial wings

122 Red-eye color, Vestigial wings

127 Sepia eye color, Normal wings

Cross II:

Parents: Heterozygous gray body, normal wings × black body color, vestigial wings.

Offspring results:

236 Gray body, normal wings.

253 Black body, Vestigial wings.

50 Gray body, Vestigial wings.

61 Black body, Normal wings.

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Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…

Answer 2

Question

Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

Chapter 12.4, Problem 6R

Summary Introduction

To review:

The linked genes from the data and the distance between them in map units.

Introduction:

Linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern. These genes have the short distance in them in map units, thereby they get inherited as a unit and they do not segregate separately.

The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows:

Cross I:

Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings.

Offspring results:

131 Red-eye color, Normal wings

120 Sepia eye color, Vestigial wings

122 Red-eye color, Vestigial wings

127 Sepia eye color, Normal wings

Cross II:

Parents: Heterozygous gray body, normal wings × black body color, vestigial wings.

Offspring results:

236 Gray body, normal wings.

253 Black body, Vestigial wings.

50 Gray body, Vestigial wings.

61 Black body, Normal wings.

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Answer 3

Question

Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

Chapter 12.4, Problem 6R

Summary Introduction

To review:

The linked genes from the data and the distance between them in map units.

Introduction:

Linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern. These genes have the short distance in them in map units, thereby they get inherited as a unit and they do not segregate separately.

The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows:

Cross I:

Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings.

Offspring results:

131 Red-eye color, Normal wings

120 Sepia eye color, Vestigial wings

122 Red-eye color, Vestigial wings

127 Sepia eye color, Normal wings

Cross II:

Parents: Heterozygous gray body, normal wings × black body color, vestigial wings.

Offspring results:

236 Gray body, normal wings.

253 Black body, Vestigial wings.

50 Gray body, Vestigial wings.

61 Black body, Normal wings.

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Answer 4

Question

Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

Chapter 12.4, Problem 6R

Summary Introduction

To review:

The linked genes from the data and the distance between them in map units.

Introduction:

Linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern. These genes have the short distance in them in map units, thereby they get inherited as a unit and they do not segregate separately.

The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows:

Cross I:

Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings.

Offspring results:

131 Red-eye color, Normal wings

120 Sepia eye color, Vestigial wings

122 Red-eye color, Vestigial wings

127 Sepia eye color, Normal wings

Cross II:

Parents: Heterozygous gray body, normal wings × black body color, vestigial wings.

Offspring results:

236 Gray body, normal wings.

253 Black body, Vestigial wings.

50 Gray body, Vestigial wings.

61 Black body, Normal wings.

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Answer 5

Chapter 12.4, Problem 6R

Summary Introduction

To review:

The linked genes from the data and the distance between them in map units.

Introduction:

Linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern. These genes have the short distance in them in map units, thereby they get inherited as a unit and they do not segregate separately.

The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows:

Cross I:

Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings.

Offspring results:

131 Red-eye color, Normal wings

120 Sepia eye color, Vestigial wings

122 Red-eye color, Vestigial wings

127 Sepia eye color, Normal wings

Cross II:

Parents: Heterozygous gray body, normal wings × black body color, vestigial wings.

Offspring results:

236 Gray body, normal wings.

253 Black body, Vestigial wings.

50 Gray body, Vestigial wings.

61 Black body, Normal wings.

Answer 6

Chapter 12.4, Problem 6R

Summary Introduction

To review:

The linked genes from the data and the distance between them in map units.

Introduction:

Linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern. These genes have the short distance in them in map units, thereby they get inherited as a unit and they do not segregate separately.

The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows:

Cross I:

Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings.

Offspring results:

131 Red-eye color, Normal wings

120 Sepia eye color, Vestigial wings

122 Red-eye color, Vestigial wings

127 Sepia eye color, Normal wings

Cross II:

Parents: Heterozygous gray body, normal wings × black body color, vestigial wings.

Offspring results:

236 Gray body, normal wings.

253 Black body, Vestigial wings.

50 Gray body, Vestigial wings.

61 Black body, Normal wings.

Answer 7

Chapter 12.4, Problem 6R

Summary Introduction

To review:

The linked genes from the data and the distance between them in map units.

Introduction:

Linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern. These genes have the short distance in them in map units, thereby they get inherited as a unit and they do not segregate separately.

The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows:

Cross I:

Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings.

Offspring results:

131 Red-eye color, Normal wings

120 Sepia eye color, Vestigial wings

122 Red-eye color, Vestigial wings

127 Sepia eye color, Normal wings

Cross II:

Parents: Heterozygous gray body, normal wings × black body color, vestigial wings.

Offspring results:

236 Gray body, normal wings.

253 Black body, Vestigial wings.

50 Gray body, Vestigial wings.

61 Black body, Normal wings.

Answer 8

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Answer 9

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Answer 10

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Answer 11

Ch. 12.1 - Prob. 1R Ch. 12.1 - Prob. 2R Ch. 12.1 - Prob. 3R Ch. 12.1 - Prob. 4R Ch. 12.2 - Prob. 1R Ch. 12.2 - Prob. 2R Ch. 12.2 - Prob. 3R Ch. 12.3 - Prob. 1R Ch. 12.3 - Prob. 2R Ch. 12.3 - Prob. 3R

Solution Summary: The author explains that linked genes are those, which get inherited together and do not follow the normal Mendelian inheritance pattern.

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Chapter 12 Solutions

131	Red-eye color, Normal wings
120	Sepia eye color, Vestigial wings
122	Red-eye color, Vestigial wings
127	Sepia eye color, Normal wings

236	Gray body, normal wings.
253	Black body, Vestigial wings.
50	Gray body, Vestigial wings.
61	Black body, Normal wings.