Biology (11th Edition)

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

Chapter 16 - Control of Gene Expression - Figure 16.4 - Data Analysis: 1

Answer

A lack of the repressor would lead to constant, and wasteful, expression of the genes for lactose metabolism. An inability of the inducer (allolactose) to bind to the repressor would have the opposite effect, preventing gene expression for lactose metabolism.

Work Step by Step

To understand this, consider the normal roles of the repressor and the inducer: to stop or to initiate expression of genes for the metabolism of lactose. Removing either of these (see Fig. 16.4) would have the opposite effect compared to normal.
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