Biology (11th Edition)

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

Chapter 15 - Genes and How They Work - Figure 15.2 - Data Analysis: 2

Answer

Double mutants can tell you the order of genes/their enzyme products in a pathway.

Work Step by Step

The second-acting mutant will be dominant in the sense that nothing will be able to be made in the pathway unless the intermediate following that mutant is provided. So, by making a series of double mutants, the order of enzymes/genes can be deduced.
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