A sex-specific test of selection in utero.


We find support for the hypothesis that changes in the monthly odds of a twin among live-born males predict subsequent and opposite changes in the odds of a twin among live-born females. The hypothesis arises from the long standing argument that natural selection has conserved mechanisms by which pregnant women in stressed populations spontaneously abort… (More)
DOI: 10.1016/j.jtbi.2008.12.008


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