Partible Paternity, the Secondary Sex Ratio, and a Possible Trivers-Willard Effect
نویسندگان
چکیده
منابع مشابه
The Trivers-Willard hypothesis: sex ratio or investment?
The Trivers-Willard hypothesis has commonly been considered to predict two things. First, that a mother in good condition should bias the sex ratio of her offspring towards males (if males exhibit greater variation in reproductive value). Second, that a mother in good condition should invest more per son than per daughter. These two predictions differ empirically, mechanistically and, as we dem...
متن کاملA Trivers-Willard Effect in Contemporary Humans: Male-Biased Sex Ratios among Billionaires
BACKGROUND Natural selection should favour the ability of mothers to adjust the sex ratio of offspring in relation to the offspring's potential reproductive success. In polygynous species, mothers in good condition would be advantaged by giving birth to more sons. While studies on mammals in general provide support for the hypothesis, studies on humans provide particularly inconsistent results,...
متن کاملThe maternal dominance hypothesis: questioning Trivers and Willard
Thirty years ago, Trivers and Willard (1973) hypothesized that parental “condition” could be central in influencing the sex ratio of offspring, “good condition” being associated with the conception of males. However, I argue that “condition” is a distraction in this otherwise useful hypothesis, because it is merely a frequent indicator of dominance (a characteristic which often leads to priorit...
متن کاملSex Differences in Intergenerational Income Transmission and Educational Attainment: Testing the Trivers-Willard Hypothesis
From an evolutionary point of view, sex differences in intergenerational transmission of income may be influenced by the Trivers-Willard (T-W) effect: Low status parents should invest more in daughters, whereas high status parents are expected to invest more in sons. This bias in parental investment may result in status-dependent sex biased parental support for higher education and educational ...
متن کاملParental Investments and Educational Outcomes: Trivers–Willard in the U.S.
In the U.S., there is evidence of a Trivers–Willard (T–W) effect in educational attainment, such that the sons of high status fathers attain more education than the daughters, and the daughters of low status fathers attain more education than the sons. This paper seeks to uncover the mechanisms by which this T–W effect occurs. Data are from the High School and Beyond Study by the U.S. National ...
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ژورنال
عنوان ژورنال: Current Anthropology
سال: 2017
ISSN: 0011-3204,1537-5382
DOI: 10.1086/692984