In the Figure Below, the Lighter Gray Circles Represent Single-Male

question 22

Multiple Choice

In the figure below, the lighter gray circles represent single-male breeding systems in primates and the darker gray circles indicate multi-male systems. Which of the following statements is consistent with these data?

• A) Single-male breeding systems select for smaller testes size because sperm are not needed to increase reproductive success.
• B) Body weight does not influence testes size because selection only favors large testes in multi-male systems.
• C) Species with multi-male systems evolve larger testes because they have higher body weights.
• D) Selection favors large testes relative to body weight when a male's sperm must compete directly with other males.

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