Biology (11th Edition)

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

Chapter 24 - Genome Evolution - Figure 24.7 - Inquiry Question: 1

Answer

The number of duplicate genes drops due to loss of whole chromosomes or loss of parts of chromosomes. This occurs at different rates in the multiple genomes of a polyploid.

Work Step by Step

It is not completely clear why this happens, but it may be that it has something to do with replication rates for DNA. Also, if there are duplicate genes, some copies could be lost without losing gene function, leading to a fully functional but more efficient organism.
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