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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-.

Dr Merayo-Rodriguez agreed

Answered 12/16/2012

5.7k views

Thank

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