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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 4QP
Textbook Problem
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Do you think Frederick William’s experiment would have worked better if he had ordered brother–sister marriages within tall families instead of just choosing the tallest individuals from throughout the country?

Summary Introduction

To determine: Whether Frederick William’s experiment would have worked better if he had ordered brother-sister marriages within tall families instead of just choosing the tallest individuals from throughout the country.

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. It means that the height of a particular individual is governed by two or more genes (polygenic trait) and significant environmental interaction. This trait produces a number of phenotypes between the two extreme phenotypes used for breeding because of its polygenic nature. The phenotypes do not depict Mendelian rations because of this phenomenon.

If Frederick William would have allowed brother-sister marriages, still the results would have been the same as breeding of only tall individuals was allowed. In humans, height is controlled by multiple genes...

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