Further proof that mammalian intercourse ratios at delivery are partially managed by parental hormones
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The note that is present an effort to augment past argument regarding the hypothesized parental hormonal antecedents of mammalian offspring intercourse ratios. It really is meant that the audience who has got read both this paper and my paper that is previous should aware of all of the data regarding 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 associated with the hormones levels of both moms and dads round the period of conception. We first made such an indicator in James (1980 ). Within their summary of mammalian intercourse ratios, Clutton-Brock and Iason (1986 ) had written ‘in view of. the obvious lack of hereditary variance within the intercourse ratio, a hormone apparatus mediated by environmental factors operating either at conception or through the individual’s development seems to be probably the most most most likely description of intercourse ratio variation’.