Is it possible for my child to be a b positive blood type when both parents are !


Question:

Is it possible for my child to be a b positive blood type when both parents are a o positive?


Answers:

No, it is impossible - if both parents are O+ than the child must also be O+.

Obviously the mother is O+ and the child is B+, therefore the father could only be B or AB, either + or - because + is dominant.

Edit - TO 1M9, you are correct in saying that there are 2 alleles in the ABO system, but both parents were OO, if a person is BO we just call it B+ or -. So if both parents were BO than the child would be either B or O, but in this case it is stated that both parents are O+, so both their alleles would be O. Both parents would be OO and OO so the child would have no choice but to also be OO. If a person had the alleles BO than there blood type is B not O as B is dominent. I hope that wasn't confusing :P




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