Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 20 - Genes Within Populations - Figure 20.9 - Inquiry Question: 1

Answer

With the data shown, one would expect an increase in the number of intermediate-length female water striders due to the greater total number of offspring produced. However, if body size did not affect the number of eggs laid, then selection against longer individuals would lead to a decrease in the average length.

Work Step by Step

Look at the charts--the left and center panels add together to give the result on the right, which indicates selection for intermediate body length, However, taking out the left panel (egg number per day increasing with body size), leaves the center panel, which indicates selection for shorter body length.
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