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A member asked:
How could blood groups originate?
A doctor has provided 1 answer
Genetic drift: There is no obvious selective advantage for A, B or O in nature, and these seem to be the result of random mutations. Some of the African blood groups, famously Duffy Negative, arise in response to selective pressure because it gives immunity to the local form of malaria. You may find this site helpful http://sandwalk.blogspot.com/2007/02/abo-blood-types.html
Answered 6/26/2014
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