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 20.10 - Data Analysis: 1

Answer

This experiment shows that the selection is based on phenotype frequency, not on phenotype itself (which would be directional selection). Fish do not prefer one particular color, just the color that is most prevalent at given place or time.

Work Step by Step

Consider the two kinds of selection: directional selection acts for one phenotype and against another, consistently. Frequency-dependent selection varies the selected phenotype by how common it is. Clearly the results here fit the latter case.
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