Natural Selection of Parental Ability to Vary the Sex Ratio of Offspring

American Association for the Advancement of Science (AAAS) - Tập 179 Số 4068 - Trang 90-92 - 1973
Robert Trivers1, Dan E. Willard2
1Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138.
2Mathematics Department, Harvard University#TAB#

Tóm tắt

Theory and data suggest that a male in good condition at the end of the period of parental investment is expected to outreproduce a sister in similar condition, while she is expected to outreproduce him if both are in poor condition. Accordingly, natural selection should favor parental ability to adjust the sex ratio of offspring produced according to parental ability to invest. Data from mammals support the model: As maternal condition declines, the adult female tends to produce a lower ratio of males to females.

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American Association for the Advancement of Science (AAAS)

Tập 179 Số 4068

90-92

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