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Never. Although, genes for ABO and Rh blood groups are present on the surface of RBCs but ABO and Rh blood group systems are different. Rh positive is always dominant to Rh negative gene irrespective of ABO blood groups. Hence, Rh positive blood group always express itself.

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15y ago

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O neg and O pos parents what happens to children?

If both parents are O negative and O positive, their children may inherit various blood types depending on their parents' genotype. However, all children will carry at least one O antigen in their blood type. The parents could have children with blood types O negative, O positive, A negative, A positive, B negative, B positive, AB negative, or AB positive.


Can parents with b negative blood have a child with o positive blood?

If both parents are B- they can only have children who are B- and O-. One would have to be positive in order to have a child with positive blood.


Can a child with b negative blood have parents with o positive?

Only if he's adopted. Parents with a + blood type can have children with a - blood type, but parents with an O bloodtypes can only have O type children together.


Can O negative parents have an O positive child?

If they are both O negative, no, the child will be O negative.


Can a child be O negative if the parents are O positive and their are three grandparents who are O positive and one is B negative?

Yes.


Can parents who have B negative and O positive blood types have a child with O positive blood?

No, they will have a O negative child.


Can o positive and o positive make a B negative or b positive?

No - if both parents have blood type O, then the only possibility for their children is also blood type O. If they are both heterozygous for Rh (+/-) then they could have either + or - children. If either of them are homozygous (Rh+Rh+) then all the children will be +.


What blood type does a 0 negative and a b positive make?

The possibilities include B positive, B negative, O positive, O negative.


Can an A positive mother and an O negative child have an AB child?

No. If both parents have type O blood then they will only be able to have children with type O blood.


Can both o positive parents have a o negative baby?

Nope, the baby will be O positive as well.


If both parents are A positive what usually will the child have?

A or O positive or negative


If both the parents have O Negative blood can a daughter be O Positive?

No