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A member asked:
My mom has a positive and my dad as a negative. my sister both have a but i have o negative. how does that happen?
A doctor has provided 1 answer
Type A = AA or AO: Two parents who are both type a blood can have both type a or type o children. If one parent is rh positive, and the other is rh negative, then they can have either positive or negative children.
Answered 12/9/2013
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