Monday, February 28, 2011

Are humans still evolving by Darwin's natural selection?

The most obvious example of this is lactose, the sugar in milk. Some 10,000 years ago, before humans started farming, no one could digest this beyond a few years of age.

But today, the rate of lactose tolerance in different parts of the world is a clue to the different histories of farming across the globe. While 99% of Irish people are lactose tolerant, in South-East Asia, where there is very little tradition of farming, the figure is less than 5%. FULL ARTICLE