jun 21, 2000000 - Space colonies genetically distinct if seperated 2mil years
Description:
Vertebrate species separated for this long will generally undergo allopatric speciation. Evolutionary biologist James W. Valentine predicted that if humanity has been dispersed among genetically isolated space colonies over this time, the galaxy will host an evolutionary radiation of multiple human species with a "diversity of form and adaptation that would astound us". (This would be a natural process of isolated populations, unrelated to potential deliberate genetic enhancement technologies.)
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