The present note is an effort to augment past argument regarding the hypothesized parental hormonal antecedents of mammalian offspring intercourse ratios. It’s meant that the audience who has got read both this paper and my paper that is previous should aware of all of the data concerning the hypothesis James WH (1996), J Theor Biol 180, 271–286.
It is often hypothesized that the sexes of offspring of mammalian (including individual) parents are causally linked to the hormone levels of both moms and dads round the period of conception. We first made such an indicator in James (1980 ). Inside their report about mammalian intercourse ratios, Clutton?Brock and Iason (1986 ) composed ‘in view of. the obvious not enough hereditary variance within the intercourse ratio, a mechanism that is hormonal by ecological facets operating either at conception or through the individual’s development is apparently the essential most most most likely description of intercourse ratio variation’. Читать далее «Further proof that mammalian intercourse ratios at delivery are partially managed by parental hormones»