The note that is present an effort to augment past argument regarding the hypothesized parental hormonal antecedents of mammalian offspring intercourse ratios. Its meant that a audience who may have read both this paper and my past paper must certanly be aware of all data regarding the hypothesis James WH (1996), J Theor Biol 180, 271–286.
It was hypothesized that the sexes of offspring of mammalian (including individual) parents are causally linked to the hormones levels of both moms and dads round the period of conception. We first made such an indicator in James (1980 ). Inside their post on mammalian intercourse ratios, Clutton?Brock and Iason (1986 ) had written ‘in view of. the apparent not enough hereditary variance into the intercourse ratio, a mechanism that is hormonal by ecological factors operating either at conception or throughout the individual’s development is apparently the absolute most most likely description of intercourse ratio variation’. Continue reading “Further proof that mammalian intercourse ratios at delivery are partially managed by parental hormones”