Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 13 - Chromosomes, Mapping, and the Meiosis-Inheritance Connection - Figure 13.14 - Inquiry Question: 1

Answer

Scenario 1: The mother has both of her X chromosomes go into her egg, which is then fertilized by a sperm with a Y chromosome. Scenario 2: The father has both his X chromosome and his Y chromosome go into his sperm, which then fertilizes an egg with one X chromosome.

Work Step by Step

To figure this problem out, first consider the normal genetic makeup of males (XY) and females (XX). Then construct scenarios in which an extra X chromosome ends up in a gamete but in which a Y chromosome can also be found in the resulting child.
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