Black sperm's potential

I recently read that 1 in 6 marriages involve couples of different racial/ ethnic backgrounds. However I don't think that is accurate for this part of the country. Physical differences in populations occur because populations are separated from other populations and the people makes specific adaptions to the environment they live in. Now very few populations are truly isolated and if a person has the funds he or she can be nearly anyplace on the planet within a day or so. It a safe bet that as the populations mix more so will the DNA. I think it will take around 3 or 4 centuries before racial distinctions will be blurred to the point of irrelevance
 
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