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To: Lazarus_Long who wrote (9546)	4/17/2002 8:49:12 PM
From: TigerPaw	of 21057

humanity may have gone almost extinct Current thought on speciation: usually occurs in a small isolated group as a result of genetic drift and natural selection. This event can be thought of as a "bottleneck" --the population of a species is reduced to a small number and then builds up -- or as "founder effect" --where a new species starts out with just a few members. In both cases, the allele frequencies are quite different from the original population, and many alleles are fixed--only one allele in the popualtion for a given gene. Much genetic evidence points to a bottleneck in the human species between 100,000 and 300,000 years ago. This period probably represents the origin of Homo sapiens. bios.niu.edu There is also a ice age related bottleneck event exclusive to Europeans which lead to much diminished genetic diversity in the decendants. discover.com TP

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