The current note is an effort to augment past argument regarding the hypothesized parental hormonal antecedents of mammalian offspring intercourse ratios. Its meant that a audience that has read both this paper and my past paper must be 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 pertaining to the hormones levels of both parents all over period of conception. We first made such an indication in James (1980 ). Within their breakdown of mammalian intercourse ratios, Clutton?Brock and Iason (1986 ) penned ‘in view of. the obvious not enough hereditary variance in the intercourse ratio, a hormone apparatus mediated by ecological facets operating either at conception or throughout the individual’s development is apparently the absolute most most blog likely description of sex ratio variation’. Continue reading “Further proof that mammalian intercourse ratios at delivery are partially managed by parental hormones”