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 10 - Self-Quiz - Page 174: 11

Answer

b.

Work Step by Step

By the activation and inactivation of different sequences of the ABC genes, flowers can form. Expression of the A gene causes the formation of sepals only. Then, activation of both the A and B genes together form the petals. Switching off the A gene, keeping the B gene turned on, and then activating the C gene causes the stamens to form. Turning off the B gene and keeping the C gene activated causes the formation of the carpel.
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