Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 18 - Assess - Page 409: 1

Answer

1. c

Work Step by Step

c Changes occur in the zona pellucida Changes in zona pellucida after the binding of one sperm constitute a late block to polyspermy. Substances released by the cortical granules cause the zona to swell and harden and exclude other sperms.
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