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Evolution__3rd_Edition

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254 PART 3 / Adaptation and Natural Selection<br />

Chapter 12 uses three examples from sexual reproduction to illustrate the practical study<br />

of adaptation. The deepest problem a of why sex exists a is still mainly at the stage of<br />

developing a hypothesis. The theory of sexual selection is well developed, and the crucial<br />

empirical work is now beginning. In the theory of sex ratios, there is a good match of theoretical<br />

prediction and empirical tests. The existence of sex itself is one of the biggest<br />

unsolved problems in biology. The problem of sex ratios is not only solved, but provides a<br />

powerful “model system” for the analysis of adaptation.<br />

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