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 20.20 - Inquiry Question: 1

Answer

Selection needs genetic variation to operate, and perhaps the racehorses have become too genetically uniform since the 1950's for selection to increase speed/decrease winning time.

Work Step by Step

The horses in the Kentucky Derby are so highly valued and have been bred for so long that, perhaps, a genetic equilibrium has been reached with little variation on which selection can operate.
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