Making the rounds: Scientists have discovered a remarkable case of very recent evolutionary change in the human species. This time it's the relationship of lactose tolerance and the domestication of cattle. Scientists are finding a direct correlation between the two in several different populations. The mechanisms that provide this are different in different populations, but the result is still the same.
Very interesting - especially considering that convergent/divergent evolution of humans was a topic of debate when I got my degree (the vogue view being that Homo Sapiens managed to develop both in Africa/Fertile Crescent and India/China at roughly the same time.
Posted by: ron on December 11, 2006 11:14 AMVery interesting, especially considering that convergent vs divergent evolution of humans was a topic of debate when I got my degree (the vogue view being that Homo Sapiens managed to develop both in Africa and the Fertile Crescent and India to China region at roughly the same time.
Posted by: ron on December 11, 2006 11:16 AMDAMMIT!!!! I didn't double post. I got the 500 error, then reposted. Should I have checked the site first?
Posted by: ron on December 11, 2006 11:21 AMYup. Quirk of the site. It's always done that, so we don't take multiple postings personally :)
Posted by: scott on December 11, 2006 12:03 PMThe multi-regional hypothesis has come under heavy fire since then, due mostly to DNA testing. Said testing has revealed, for example, the further you get away from Africa, the less diverse the gene pool gets. Were H. sapiens to have evolved in a lot of places all at once, there would not be such a heavy genetic "arrow" pointing at that continent from all directions.
Posted by: scott on December 11, 2006 12:08 PMAbove comment triggered two overly-broad regexps for catching spam. These have been revised, so hopefully it won't be as fussy as it has been lately. Still with 450+ rules, these sorts of things will happen.
Posted by: scott on December 11, 2006 12:10 PMI seem to remember hearing that as well. But at the time, it was open speculation as there were genes that were present in one population that seemed to be completely absent from others, along with certain phenotypic differences that hadn't been explained.
Posted by: ron on December 11, 2006 12:16 PM