Biology (11th Edition)

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

Chapter 19 - Cellular Mechanisms of Development - Review Questions - Synthesize: 1

Answer

4 cell divisions for the nervous system and 9 for the gonads.

Work Step by Step

To get to this answer, start at the egg and count successive horizontal lines (each is a successive cell division as you move down the chart) until you get to the labelled population about which the question asks.
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