can an a positive and an o positive make an o negative child?

Answer 1

Yes. Rh factor (the + or - in blood type) is a dominant trait, so it could be that both parents possess only one Rh gene. If this be the case, then there is a 25% chance that their child will be Rh negative, if both parents pass on the recessive gene to their child.

Answer 2

No they can't
Because 1st the 2 of them R +
2nd only if the A+ is heterozygous ie: AO, the child could have O+ blood Group

Answer 3

probably not, but I would consult a doctor for the better answer.
The positive means you have antibodies that a negative doesn't have. If you both have antibodies, you will probably have a positive blood type child.

Answer 4

Sure..My parents were both O positive,and I'm an O negative.If you have an O negative child,make sure they carry a medical alert card with them when they get older.(I had them put it on my driver's license),and I have dogtags I wear if I don't have my license on me.

Answer 5

not quite.... there is no real evidence to make it so. But there are always anomalies that would condur with scientific reasonings. think of it this way can AA+OO make Oo?

Theres no negative in it. So i dont think you can make a negative out of positives..

Answer 6

when they take on your subtype. for example an o positive may have an a negative subtype

Answer 7

(IA IA), (Ia Ia), (IA Ia), is the only genotype for a blood type A

(IO IO) is the only gentype for blood type O

RH --- this determines +/-

If you do your punnet square right youl see one or two possibility's of getting an O - child.

Answer 8

sometimes, why?