Campbell Biology: Concepts & Connections (9th Edition)

Published by Pearson
ISBN 10: 0-13429-601-X
ISBN 13: 978-0-13429-601-2

Chapter 1 - Review - Page 18: 11

Answer

Heritable variations play an important role in Darwin's theory of natural selection because some variations lead to better reproductive success than others. Therefore, these variations help determine the level of reproductive success and hence, biological change over time.

Work Step by Step

Darwin observed both heritable variations and overproduction of offspring, traits which are common to all species. These lead to natural selection and gradual species change.
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