Human Reproduction, Vol. 19, No. 6, 1495-1496,
June 2004
© 2004 European Society of Human Reproduction and Embryology
Reply to a further note on the sex ratios of births conceived during wartime
Instituto de Ginecología y Fertilidad, M.T. de Alvear 2259, C1122AAI Buenos Aires, Argentina
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I thank Professor James for his letter on sex ratio biases after wartime (Bisioli, 2004
; Zorn, 2004
) focusing on proximate (physiological) versus ultimate (evolutionary) explanations and the length of the sex ratio biases.
Plausible proximate