Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 12 - Self-Quiz - Page 199: 11

Answer

a. prophase I

Work Step by Step

Crossing over occurs in meiosis I, specifically in prophase I. At this stage, homologous chromosomes line up close and parallel to one another. This alignment allows segments of DNA to easily change places between the pair of homologous chromosomes.
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