The Figure Shows the Genealogies for Two Different Genes

question 22

Multiple Choice

The figure shows the genealogies for two different genes. Which of the following is a reasonable explanation for the observed difference?

• A) The gene in A is neutral. The gene in B experienced balancing selection.
• B) The population size is smaller in A than B.
• C) The gene in A is neutral. The gene in B experienced positive selection.
• D) The mutation rate is lower in gene A than gene B.

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Definitions:

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