A sex-specific test of selection in utero.

@article{Catalano2009AST,
  title={A sex-specific test of selection in utero.},
  author={Ralph Catalano and Katherine Saxton and Tim Bruckner and Sidra Goldman and Elizabeth J. Anderson},
  journal={Journal of theoretical biology},
  year={2009},
  volume={257 3},
  pages={475-9}
}
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 fetuses least likely to yield grandchildren. Previous attempts to empirically test this argument focus almost entirely on males. We contribute… CONTINUE READING