Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 22 - 22.2 - Concept Check: 2

Answer

An extinct high-altitude mammal could resemble both the lowland South American mammals and the high altitude African mammals. It would resemble the former based on descent from a common South American ancestor, but it could resemble the latter due to convergent evolution driven by similar selection pressures at high altitude.

Work Step by Step

Skim this chapter for information on convergence, and review earlier material on genetics to see that conserved mechanisms such as homeotic genes would tend to preserve similarities with nearby relatives having a common ancestor.
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