Campbell Biology (11th Edition)

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

Chapter 34 - 34.7 - Concept Check - Page 752: 3


The fossils mentioned in the text stretch back to 115,000 years ago (outside Africa), more than twice the age suggested by genetic studies as cited in the question. Both could be correct if the ancestor of all living humans was not a descendant of the population from 115,000 years ago. There may have been multiple exits from Africa, only one of which led to modern populations around the world.

Work Step by Step

The thing to see here is that the genetic test is looking at all current human populations, which may or may not be directly related to the fossils which are 115,000 years old.
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