Biological Science (6th Edition)

Published by Benjamin Cummings
ISBN 10: 0321976495
ISBN 13: 978-0-32197-649-9

Chapter 23 - Evolutionary Processes - Review: 6

Answer

Mutations are the material on which evolution works and natural selection eliminates some and promotes others based on what best survives and reproduces.

Work Step by Step

Mutations create genetic variation, increasing it, but not all variants are equally well adapted to survive and reproduce. When natural selection acts, some variants/mutants either die or reproduce poorly, being eventually removed from the gene pool after first being reduced in frequency. This can be thought of as the disposal of those individuals, and, thus, of their genes, from future consideration by natural selection.
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