Campbell Biology (11th Edition)

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

Chapter 45 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 1016: 9


The implication given by the book here is that, from an original receptor protein or proteins, recombination leads to the development of multiple similar protein types.

Work Step by Step

The precise evolutionary source of these receptors is unknown, though we can map the type and variety of nuclear receptor proteins along phylogenic lines with high accuracy. What is unclear is whether the original source is developed from an original common ancestor or through some other more parallel means.
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