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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 6QP
Textbook Problem
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Describe why there is a fundamental difference between the expression of a trait that is determined by polygenes and the expression of a trait that is determined monogenetically.

Summary Introduction

To determine: The fundamental difference between the expression of a trait that is determined by polygenes and the expression of a trait that is regulated monogenetically.

Introduction: The regulation of a particular trait is determined by the mode of inheritance of genes. The inheritance can be either monogenic or polygenic in nature. The differences in the type of inheritance cause variation in the phenotype of an individual.

Explanation of Solution

The monogenic traits are controlled by single genes and consist of two contrasting pair of alleles that are dominant and recessive. The monogenic traits follow the classic Mendelian pattern of inheritance. Thus the offsprings display the phenotypic characteristics of either the dominant or recessive parent.

On the contrary, polygenic traits are controlled by two or more genes...

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