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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 10QP
Textbook Problem
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Mutations Can Uncouple Chromosomal Sex from Phenotypic Sex

Give an example of a situation in which genetic sex, gonadal sex, and phenotypic sex do not coincide. Explain why they do not coincide.

Summary Introduction

To provide: An example of a situation in which genetic sex, gonadal sex, and phenotypic sex do not coincide.

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.

Explanation of Solution

The terms genetic sex, gonadal sex, and phenotypic sex are defined as follows:

  • Genetic sex

    Chromosomes of an individual are used to determine its genetic sex. A sperm with a Y chromosome, fertilizing an egg with X chromosome gives rise to a zygote having XY sex chromosomes. An individual having one X chromosome and one Y chromosome is referred to a male. An individual having XX sex chromosomes is referred to female.

  • Gonadal sex

    The male gonads are called testes. The determination of gonads does not take place during conception. The Y chromosome contains a SRY gene which activates the differentiation of gonads into testes...

Summary Introduction

To explain: The reason due to which genetic sex, gonadal sex, and phenotypic sex do not coincide.

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.

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