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    Research on high-fat diets and the sex ratio in polytocous species may indicate important differences in proximate mechanisms for sex allocation between polytocous and monotocous mammals.

    The widespread but not ubiquitous occurrence, not even within lineages, of chromosomal sex determination suggests that sex chromosomes have evolved independently several times during animal radiation, but firm evidence for this is lacking.

    The most favored model for this process is gradual differentiation of ancestral pairs of autosomes.

    In addition, it would make sense if this adaptive influence was at least partially under maternal control, given the mammalian mother's disproportionate commitment to the production of the offspring.

    Following the logic of this argument and using the theoretical framework provided by Trivers & Willard (1973), evolutionary biologists have demonstrated strong (albeit often seemingly contradictory) links between maternal characteristics and statistically significant variations in offspring secondary (birth) sex ratios (Cameron 2004, Sheldon & West 2004, Grant 2007).

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