James W H
Galton Laboratory, University College London.
Ann Hum Genet. 1995 Apr;59(2):243-9. doi: 10.1111/j.1469-1809.1995.tb00744.x.
It is suggested that the human sex ratio at birth is stabilized only to a minor extent by the direct processes of natural selection. Instead the major factors stabilizing sex ratio seem to be behavioural (coital rates) and psychological (parental perceptions of adult sex ratios). It is suggested that parental hormone levels are (a) a consequence of perceived adult sex ratios, and (b) a cause of sex ratio in the next generation, thus providing the basis for a negative feedback process stabilizing the sex ratio.
有人认为，出生时的人类性别比例仅在很小程度上通过自然选择的直接过程得以稳定。相反，稳定性别比例的主要因素似乎是行为方面的（性交频率）和心理方面的（父母对成年人性别比例的认知）。有人提出，父母的激素水平（a）是所感知到的成年人性别比例的结果，（b）是下一代性别比例的一个成因，从而为稳定性别比例的负反馈过程提供了基础。
