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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 17QP
Textbook Problem
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Equalizing the Expression of X Chromosome Genes in Males and Females

How many Barr bodies would the following individuals have?

  1. a. normal male
  2. b. normal female
  3. c. Klinefelter male
  4. d. Turner female

a.

Summary Introduction

To determine: The number of Barr bodies present in a normal male.

Introduction: The sex chromosomes present in the males differ from the sex chromosomes present in the females. The amount of the gene product expressed by the genes present on the X chromosome is equalized in both males and females through a process known as dosage compensation.

Explanation of Solution

A dense spot inside the nuclear envelope in cells from female cats was seen by Murray Barr in late 1940s. This dense spot could not be seen in the cells of male cats...

b.

Summary Introduction

To determine: The number of Barr bodies present in a normal female.

Introduction: The sex chromosomes present in the males differ from the sex chromosomes present in the females. The amount of the gene products expressed by the genes present on the X chromosome is equalized in both males and females through a process known as dosage compensation.

c.

Summary Introduction

To determine: The number of Barr bodies present in a Klinefelter male.

Introduction: The sex chromosomes present in the males differ from the sex chromosomes present in the females. The amount of the gene product expressed by the genes present on the X chromosome is equalized in both males and females through a process known as dosage compensation.

d.

Summary Introduction

To determine: The number of Barr bodies present in a Turner female.

Introduction: The sex chromosomes present in the males differ from the sex chromosomes present in the females. The amount of the gene product expressed by the genes present on the X chromosome is equalized in both males and females through a process known as dosage compensation.

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