BuyFind

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
BuyFind

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter
Section
Chapter 10, Problem 12SQ
Textbook Problem
120 views

A cell with a Barr body is ___ .

  1. a. a bacterium
  2. b. a sex cell
  3. c. from a female mammal
  4. d. infected by the Barr virus

Expert Solution
Summary Introduction

Introduction: A female’s somatic cells contain an inactive X chromosome called as Barr body that was named after the Murray Barr, the discoverer.

Explanation of Solution

Reason for the correct statement:

A Barr body consists of inactivated single X chromosome usually originated in the nuclei of somatic cells of female mammals. Barr body is formed when one of the two X chromosomes present in the female mammals gets inactivated.

Option c. is given as “from a female mammal”.

Barr body is in the condensed form present in the nuclei of female mammal’s somatic cells where one of the two X chromosomes gets inactivated. Hence, the correct answer is option c.

Reasons for the incorrect statements:

Option a. is given as “a bacterium”.

A bacterium consists of a simple structure of DNA inside the cell and not the harbor complex structure like a Barr body that actually is in condensed form of X chromosome that is found only in the nuclei of female mammals.

Hence, option a...

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