Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 23 - 23.4 - Concept Check - Page 502: 2


Using the Hardy Weinberg model, any change in allele frequencies is evolutionary but this includes phenomena such as genetic drift and founder effects which do not necessarily lead to changes which make individuals better adapted to survive and reproduce. Natural selection is the only driving force for evolution which, by its very nature, always picks the best adapted individuals to survive and contribute to the next generation, leading to better adapted individuals in the next generation.

Work Step by Step

Consider all the things which can drive evolution and how often each may lead to better adapted individuals. The only "always" should be for natural selection, by definition the driving force for evolution outside human endeavors like agriculture in which artificial selection is the driving force.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.