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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 5, Problem 15QP
Textbook Problem
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Dizygotic twins:

  1. a. are as closely related as monozygotic twins
  2. b. are as closely related as non-twin siblings
  3. c. share 100% of their genetic material
  4. d. share 25% of their genetic material
  5. e. none of these

Summary Introduction

Introduction: Dizygotic twins (DZ) are known as fraternal twins. These twins originate when the two eggs ovulated in the same ovarian cycle are fertilized independently by two different sperms. DZ twins have only half of their genes in common. These twins differ in sex and also carry different genetic markers.

Explanation of Solution

Reason for correct answer:

Dizygotic twins are formed by two separate fertilization events. In the first event, two eggs are ovulated in the same ovarian cycle; and in the second event, the two eggs are fertilized by two different sperms independently.

Option b. is given as “are as closely related as non-twin siblings.”

Dizygotic twins are as closely related as non-twin siblings because they are produced as a result of two separate sperms fertilizing two separate eggs. They are separated from the beginning and therefore, do not resemble each other. Thus, they are related to non-twin siblings.

Reasons for the incorrect answer:

Option a. is given as, “are as closely related as monozygotic twins.”

The dizygotic twins are not as related as monozygotic twins because monozygotic twins have identical genes whereas dizygotic twins have partially identical genes...

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