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How Is Sex Determined? Assume that humanlike creatures exist on Mars. As in the human population on Earth, there are two sexes and even sex-linked genes. The gene for eye color is an example of one such gene. It has two alleles. The purple allele is dominant to the yellow allele. A purple-eyed female alien mates with a purple-eyed male. All the male offspring are purple-eyed, whereas half the female offspring are purple-eyed and half are yellow-eyed. Which is the heterogametic sex? Why?

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

Solutions

Chapter
Section
BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 7, Problem 9QP
Textbook Problem
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How Is Sex Determined?

Assume that humanlike creatures exist on Mars. As in the human population on Earth, there are two sexes and even sex-linked genes. The gene for eye color is an example of one such gene. It has two alleles. The purple allele is dominant to the yellow allele. A purple-eyed female alien mates with a purple-eyed male. All the male offspring are purple-eyed, whereas half the female offspring are purple-eyed and half are yellow-eyed. Which is the heterogametic sex? Why?

Summary Introduction

To explain: The individual which shows heterogametic sex.

Introduction: The mechanism of sex determination differs from one species to another. Secondary sexual characteristic of an individual helps in the determination of its sex. Various environmental factors are responsible for the determination of sex as interaction between the environment and genes provides the criteria in the production of male and female.

Explanation of Solution

The concept of heterogametic sex determines the sex of a species which does not show common sex chromosomes. For example: In case of humans, male individual shows the XY chromosomes which show the heterozygous condition...

Summary Introduction

To explain: The alien sex (female or male) is heterogametic.

Introduction: The mechanism of sex determination differs from one species to another. Secondary sexual characteristic of an individual helps in the determination of its sex. Various environmental factors are responsible for the determination of sex as the interaction between the environment and genes provides the criteria in the production of male and female.

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