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A member asked:
Why would i have ab positive blood and my brother has b negative?
A doctor has provided 1 answer
Several ways: A & b are codominant over o. If one parent has ao alleles & other bo they can have a, b, o & ab offspring. Rh+ is dominant over rh-. If both parents have rh+ & rh- alleles they are rh+ but can pass on the rh- trait & have rh+ & rh- kids. This also happens if one parent is rh-.
Answered 12/16/2012
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