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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 7, Problem 15QP
Textbook Problem
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Sex-Influenced and Sex-Limited Traits

Explain why pattern baldness is more common in males than in females even though the gene resides on an autosome.

Summary Introduction

To determine: The reason due to which pattern baldness is more common in males than in females even though the gene resides on an autosome.

Introduction: There are obvious phenotypic differences among males and females. The differences between the sexes in humans are emphasized with the help of secondary sex characteristics which include the body size, the patterns of fat distribution, muscle mass, and the development of male or female sex organs such as penis or vagina, respectively. The phenotypic expression of a trait is different in some males and females. Sex-limited and sex-influenced traits are two reasons due to which this condition occurs.

Explanation of Solution

Sex-influenced traits are the traits which are expressed differently in both males and females. For example, the development of muscles is influenced by androgen levels in an individual. High levels of androgen in males result in the increased activation of muscle genes in males due to which they have more muscles as compared to females who have low levels of androgen thereby, causing less activation of muscle gene.

Pattern baldness is another example of a sex-influenced trait where the sex-influenced genes are expressed more in males as compared to females despite being present on an autosome...

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