tag:blogger.com,1999:blog-8732486.post6853783763391881796..comments2023-10-26T03:19:41.569-07:00Comments on Stephen Bodio's Querencia: Homo erectus and Vitamin DSteve Bodiohttp://www.blogger.com/profile/14434597061701369867noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8732486.post-73193719768378204772007-12-19T05:20:00.000-08:002007-12-19T05:20:00.000-08:00One possible explanation is that the southern hemi...One possible explanation is that the southern hemisphere gets a lot more UV radiation than the northern due to differences in the ozone layer over each pole. Dark skin may well be protective so far south for that reason.<BR/><BR/>As for the blonde Swedes, it doesn't take very long for a population to change color. Maybe someone reading can cite the number of generations necessary, given enough selective pressure and enough people to work with, but I bet you it is fewer than you think. Evolution can work fast when it has to.Matt Mullenixhttps://www.blogger.com/profile/11198069782508775543noreply@blogger.comtag:blogger.com,1999:blog-8732486.post-37168677645184436072007-12-18T16:24:00.000-08:002007-12-18T16:24:00.000-08:00In The Third Chimpanzee, Jared Diamond makes a fai...In <I>The Third Chimpanzee</I>, Jared Diamond makes a fairly convincing case that skin pigmentation may not be adaptive to sun levels at all. Why would the Tasmanians, who are about as far away from the equator as the French be so dark? They had plenty of time to evolve a more optimal coloration. Why would Scandanavians be so pale when they only migrated to that region in the comparatively recent past?<BR/><BR/>This conclusion seems to be reaching a rather long ways.<BR/><BR/>-R.A.W.Anonymousnoreply@blogger.com