Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1259188132
ISBN 13: 978-1-25918-813-8

Chapter 20 - Genes Within Populations - Review Questions - Understand - Page 419: 4

Answer

A.

Work Step by Step

Stabilizing selection eliminates extremes from the distribution of phenotypes while keeping the mean the same, while directional selection pushes phenotype to change in one direction (A.). B. is wrong since genetic variation is always required for selection, and C. states the opposite of what directional selection is. D. is wrong because A. is correct.
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