Biology (11th Edition)

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

Chapter 12 - Patterns of Inheritance - Figure 12.7 - Data Analysis: 2

Answer

50%

Work Step by Step

This is because the pedigree shows that the affected females are heterozygous (each has an unaffected parent who would give her a recessive allele since this is a dominant trait), marrying an unaffected (homozygous recessive male), means that the fourth generation would have the same chance of being affected as of getting a dominant allele from the affected mother, 50% since each of those females is heterozygous.
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