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More Crosses with Pea Plants: The Principle of Independent Assortment Think about this one carefully. Albinism and hair color are governed by different genes. A recessively inherited form of albinism causes affected individuals to lack pigment in their skin, hair, and eyes. In hair color, red hair is inherited as a recessive trait and brown hair is inherited as a dominant trait relative to red hair. An albino woman whose parents both have red hair has two children with a man who is normally pigmented and has brown hair. The brown-haired partner has one parent who has red hair. The first child is normally pigmented and has brown hair. The second child is albino. a. What is the hair color (phenotype) of the albino parent? b. What is the genotype of the albino parent for hair color? c. What is the genotype of the brown-haired parent with respect to hair color? Skin pigmentation? d. What is the genotype of the first child with respect to hair color and skin pigmentation? e. What are the possible genotypes of the second child for hair color? What is the phenotype of the second child for hair color? Can you explain this?

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 3, Problem 19QP
Textbook Problem
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More Crosses with Pea Plants: The Principle of Independent Assortment

Think about this one carefully. Albinism and hair color are governed by different genes. A recessively inherited form of albinism causes affected individuals to lack pigment in their skin, hair, and eyes. In hair color, red hair is inherited as a recessive trait and brown hair is inherited as a dominant trait relative to red hair. An albino woman whose parents both have red hair has two children with a man who is normally pigmented and has brown hair. The brown-haired partner has one parent who has red hair. The first child is normally pigmented and has brown hair. The second child is albino.

  1. a. What is the hair color (phenotype) of the albino parent?
  2. b. What is the genotype of the albino parent for hair color?
  3. c. What is the genotype of the brown-haired parent with respect to hair color? Skin pigmentation?
  4. d. What is the genotype of the first child with respect to hair color and skin pigmentation?
  5. e. What are the possible genotypes of the second child for hair color? What is the phenotype of the second child for hair color? Can you explain this?

a.

Summary Introduction

To determine: The hair color of the albino parent.

Introduction: Albinism is an autosomal recessive condition where the pigment melanin is lost from the skin that provides color to the skin. The skin becomes whitish and pale and is prone to damage under the sunlight due to albinism.

Explanation of Solution

The parent who is albino will have white hair color as the pigment melanin is absent from the skin, hair, and eyes. In order to inherit this disorder, the individual must have two copies of a defective allele from each parent...

b.

Summary Introduction

To determine: The genotype of the albino parent for hair color.

Introduction: Albinism is an autosomal recessive condition where the pigment melanin is lost from the skin that provides color to the skin. The skin becomes whitish and pale and is prone to damage under the sunlight due to albinism.

c.

Summary Introduction

To determine: The genotype of brown hair parent with respect to hair color and skin pigmentation.

Introduction: Albinism is an autosomal recessive condition where the pigment melanin is lost from the skin that provides color to the skin. The skin becomes whitish and pale and is prone to damage under the sunlight due to albinism.

d.

Summary Introduction

To determine: The genotype of the first child with respect to hair color and skin pigmentation.

Introduction: Albinism is an autosomal recessive condition where the pigment melanin is lost from the skin that provides color to the skin. The skin becomes whitish and pale and is prone to damage under the sunlight due to albinism.

e.

Summary Introduction

To determine: The genotype and phenotype of the second child for hair color.

Introduction: Albinism is an autosomal recessive condition where the pigment melanin is lost from the skin that provides color to the skin. The skin becomes whitish and pale, and is prone to damage under the sunlight due to albinism.

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Chapter 3 Solutions

Human Heredity: Principles and Issues (MindTap Course List)
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