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Height in humans is controlled by the additive action of genes and the action of environmental factors. For the purposes of this problem, assume that height is controlled by four genes— A , B , C , and D —and that there are no environmental effects. Assume further that additive alleles contribute two units of height and partially additive alleles contribute one unit of height. a. Given these assumptions, can two individuals of moderate height produce offspring that are much taller and shorter than either parent? If so, how can this happen? b. Can someone of minimum height and someone of intermediate height have children taller than the parent of intermediate height? Why or why not?

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Human Heredity: Principles and Iss...

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

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Section
BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 5, Problem 22QP
Textbook Problem
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Height in humans is controlled by the additive action of genes and the action of environmental factors. For the purposes of this problem, assume that height is controlled by four genes—A, B, C, and D—and that there are no environmental effects. Assume further that additive alleles contribute two units of height and partially additive alleles contribute one unit of height.

  1. a. Given these assumptions, can two individuals of moderate height produce offspring that are much taller and shorter than either parent? If so, how can this happen?
  2. b. Can someone of minimum height and someone of intermediate height have children taller than the parent of intermediate height? Why or why not?

a.

Summary Introduction

To determine: Whether two individuals of moderate height can produce offsprings that are much taller and shorter than either parent given that four genes-A, B, C, and D control height when there are no environmental effects.

Introduction: Height in humans is a multifactorial trait. It means that it is controlled by the interaction of one or more environmental factors and two or more genes.

Explanation of Solution

The genes A, B, C, and D adds 1 unit of height each to a base height and the recessive alleles a,b,c, and d adds no unit of height. If two parents have moderate height with genotype AaBbccdd, it means they have base height plus 2 units of height. So, to make a child that has the same height as parents, the father can contribute A and B alleles. To make a child taller, the mother can also contribute A and B alleles. Thus, the genotype of the taller child becomes AABBccdd, with 4 units of height in addition to a base, and taller than both the parents by 2 units...

b.

Summary Introduction

To determine: Whether an individual with minimum height and another individual with intermediate height produce children that are taller than the parent of intermediate height.

Introduction: Height in humans is a multifactorial trait. It means that it is controlled by the interaction of one or more environmental factors and two or more genes. The four genes that control height in the case are A, B, C, and D and there are no environmental effects. The additive alleles contribute two units of height, and partially additive alleles contribute one unit of height.

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