Hello, Peter. Thank you for your question. Most of the genetic variation
that has been established regarding lactose intolerance evolved since the
last ice age ended, around 10,000 years ago. Climate has been relatively
stable since then -- no major differences, for example, Northern Europe
has not been tropical. 10,000 years is sufficient for such population
genetics to evolve.
Deb (via Karen Kalumuck)
3601 Lyon Street
San Francisco, CA 94123-1099
On Wed, 19 Jan 2005, Peter Piacenza wrote:
> The explanation on differences amongst populations presupposes that climate
> and temperature in the world's regions, were similar to today's, clearly not
> the case if one examines the meteorological evidence.
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