Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 14 - Test Your Understanding - Level 1 - Knowledge/Comprehension: 3

Answer

1/2 of the couple's children should have extra digits.

Work Step by Step

Let P=polydactyly allele and p=normal allele. To have a normal daughter (pp) with a normal wife (pp), the man must be Pp. That means that the man and his wife make Ppxpp. The Punnett square shows an expected phenotypic ratio among their children of 1:1 Pp:pp or polydactyly:normal phenotypes.
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