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Biology: The Unity and Diversity o...

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

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 14, Problem 9SQ
Textbook Problem
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Klinefelter syndrome (XXY) can most be easily diagnosed by _______.

  1. a. pedigree analysis.
  2. b. aneuploidy
  3. c. karyotyping
  4. d. phenotypic treatment

Summary Introduction

Introduction: Normally, males have an X and a Y chromosome and, females have two X chromosomes. These sex chromosomes determine the sex of an individual. In some cases, a male is born with an additional X chromosome, that is, XXY. It occurs by chance. This is known as Klinefelter syndrome and causes sterility as males have small testicles.

Explanation of Solution

Reason for the correct statement:

The diagnosis can be made on the basis of physical characters in males but has to be confirmed with chromosome analysis. The best way to confirm the presence of an extra X chromosome in Klinefelter syndrome is through karyotyping and analyzing sex chromosomes. Karyotyping includes chromosome pairing and ordering in an organism. It analyzes the number and structure of chromosomes to detect chromosomal anomalies.

Hence, option c. is correct.

Reasons for the incorrect statement:

Option a. is given as “pedigree analysis”...

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