Here is an interesting story which sheds light on the process by which biologists assign a taxonomic designation. It's about a little dolphin that was first thought of as a variety or subspecies, now reclassified as a separate species, upon closer genetic examination.
http://news.yahoo.com/s/afp/20050705...e_050705172006
Quote:
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The snubfin was initially thought to have been an Irrawady dolphin, usually found in Asia and Australia, but DNA tests proved that it was a different species, said Beasley of James Cook University in Townsville.
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Isnt it then fair of us to ask, might not Negroes be assigned one day to a separate homonid species?
And, what is the difference, or divergence, in DNA that definitively marks a "separate species--" if anything?