Human Evolution - Speciation

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Dormammu, you mentioned "If a couple knows they have the ressesive genes for a harmful disease they might take steps to make shure that their children don't inherit the disease"..what kind of "steps" are you referring to? I'm not sure if you mean PREVENTIVE steps or simply a "heads up" so treatments can be arrranged.

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These steps would be going through an IV process, sorting the embryo's to determine which carry the disease, and then implanting one or more that does not through standard IVF techniques.

Is that genetic though? Because I wonder how much of that might arise from the integration of the mothers and childs bloodstreams, and the exchange of chemicals and hormones et al.

Interesting - I did not know this was genetically identifiable.Does anyone know if a timescale can be established for when this mutation was introduced?

I find this fascinating, not least because alcohol-gathering in africa is established and low tech, so I had kinda assumed that it was a very early development. Again, several animals produce types of alcohol as well. But this would all suggest that serious accomodation of alcohol occurs after homsap is geographically separated to a significant degree.