Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 23 - Evolution of Genes and Genomes - 23.1 - DNA Sequences Record the History of Gene Evolution - 23.1 Recap - Learning Outcomes - Page 490: 2

Answer

Multiple observed sequences are descended from a common ancestral sequence and have experienced a series of substitutions. Though the observed sequences differ by only three nucleotides, the three differences are the result of nine substitutions. In the figure, the different nucleotides are represented by colored letters and the substitutions are displayed with arrows.

Work Step by Step

Multiple observed sequences are descended from a common ancestral sequence and have experienced a series of substitutions. Though the observed sequences differ by only three nucleotides, the three differences are the result of nine substitutions. In the figure, the different nucleotides are represented by colored letters and the substitutions are displayed with arrows.
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