In evolutionary biology, the Trivers–Willard hypothesis[1], formally proposed by Robert Trivers and Dan Willard, predicts greater investment in males by parents in good conditions and greater investment in females by parents in poor conditions (relative to parents in good condition). The reasoning for this prediction is as follows: assume that parents have information on the sex of their offspring and can influence their survival differentially. While pressures exist to maintain sex ratios at 50%, evolution will favor local deviations from this if one sex has a likely greater reproductive pay-off than is usual.
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