Biology (11th Edition)

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

Chapter 53 - Animal Development - Figure 53.20 - Data Analysis: 1

Answer

The other is probably the gene for a receptor for the signal molecule. With either the signal or the receptor broken, pigmentation would be lost.

Work Step by Step

As an analogy, if a lock were broken in such a way that it were jammed in the locked position or if the key for that lock were broken, you couldn't open the lock. The lock is like the receptor and the key is like the signal molecule.
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