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 20.19 - Data Analysis: 3

Answer

The index is lower and drops off more quickly with distance on the left side.

Work Step by Step

Again, simply look at the height of the bars showing resistance. This is probably because less copper moves less far against the wind, limiting selection for resistance on the left side of the graph.
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