Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 21 - 21.5 - Concept Check - Page 457: 2


Extra exons could arise from phenomena like unequal crossing over happening repeatedly. It's also possible that DNA polymerase sliding backwards by mistake would make an extra copy of that part of the gene.

Work Step by Step

Review the mechanisms in Concept 21.5 which are said to be able to generate extra copies of DNA, and look for one which duplicates smaller regions such as exons.
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