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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 5, Problem 3QP
Textbook Problem
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What role might environment have played in causing Frederick William’s problems, especially at a time when nutrition varied greatly from town to town and from family to family?

Summary Introduction

To determine: The role played by the environment in causing Frederick William’s problems, at a time when nutrition varied greatly from town to town and from family to family.

Introduction: King Frederick William worked on human genetics. He studied the trait of height in humans. In his work, he allowed the breeding between tall individuals, expecting that all their offsprings will be tall. The results were different from his expectations because most of the children were shorter than the parents.

Explanation of Solution

Height is a multifactorial trait in humans. This means that the height of a particular individual is governed by two or more genes (polygenic trait) and is governed by significant environmental interaction. This trait produces number of phenotypes which are present between the two extreme phenotypes that are used for breeding, because of its polygenic nature. The phenotypes do not show the Mendelian ratios due to this phenomenon.

The full expression of the genotype also depends on the environment of an individual. The environment of an individual involves the conditions in which the person has been brought up...

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