Sexual selection favors female-biased sex ratios: the balance between the opposing forces of sex-ratio selection and sexual selection.

Abstract excerpt

In a verbal model, Trivers and Willard proposed that, whenever there is sexual selection among males, natural selection should favor mothers that produce sons when in good condition but daughters when in poor condition. The predictions of this model have been the subject of recent debate. We present an explicit population genetic model for the evolution of a maternal-effect gene that biases offspring sex ratio....

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