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: 2

Answer

The index drops off slowly with distance from the mine on the right hand side.

Work Step by Step

This is probably because the wind moves the copper pollution from the mine farther from the mine, and provides selection for resistance at a greater distance from the mine on the right side.
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