Human Evolution - Speciation

Actually, drinking Alcohol has had a measurable effect on the genes of different cultural groups.Since long-distance times european cultures drank beer. They did this because water was too unsafe to drink, while no known pathogens can survive in beer (due to the alcohol). Meanwhile oriental cultures boiled their water to purify it.The result: Asians tend to have a lower alcohol tolerance than europeans, and alcohol does more harm to their bodies.

Was that a reply to me? Yes, it's genetic. In that tee-total parents of europeans still produce alcohol tolerant children, and drunkard asians still produce alcohol-intolerant children (typically). I remember reading that they had identified the actual genes responsible, but I don't have a source handy for that.

Sweet. Thanks, Mammuthus.

It seems to me you aren't clear on your terms. Continuous consumption of alcohol in Europeans did not mutate their genes; it selected for people with a higher alcohol tolerance - presumably because they were more able to function while drinking, and less likely to consume other, less safe, liquids thus increasing both their likelyhood of surviving to adulthood and their ability to support more children. In short, no. Unless that physical exertion was directed towards a goal that increased (at least one of) their likelyhood of living to reproductive age, their ability to attract mates and their ability to support children (for example, if they were hunted by fierce predators faster runners could be more likely to survive, women could prefer more athletic men or among active hunters there could be a selection pressure for higher endurance and faster runners, respectively).