Biology (11th Edition)

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

Chapter 15 - Genes and How They Work - Review Questions - Apply - Page 303: 7

Answer

B.

Work Step by Step

D. is the opposite of B. the correct answer, and so can be eliminated, as can C. since mutations occur all the time, not just in the past. A. can be true but is usually not the case--most mutations are deleterious.
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