Campbell Biology (11th Edition)

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

Chapter 21 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 464: 2

Answer

A.

Work Step by Step

B is wrong since they are found in many organisms, and C is incorrect because other genes contain homeoboxes (the ones regulated by homeotic genes). D can be excluded since homeotic genes control other genes which do the actual building of structures.
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