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Each person receives an A, B, or O gene from each parent. In this system, the A and B genes are co-dominant and the O gene is recessive. Thus, a person whose genetic type is either AA or AO will have blood type A, those with genetic type BB or BO will have blood type B, and only those genetic type OO will have blood type O. This means that a child with type O blood could have parents with type A, type B, or type O blood (but not with type AB). Conversely, if two parents both have type O blood, all their children will have type O blood.

Another medically important blood type is described in the Rh system. These genes were first discovered in the rhesus monkey, hence the designation Rh. The Rh system is actually far more complex than the ABO system in that there are 35 different possibilities that one could inherit from each parent. These, however, are roughly grouped into positive and negative types. In this system the positive are dominant over the negative. If your genetic type is ++ or +-, your blood type will be Rh positive. Only if your genetic type is -- will you be Rh negative. This means that if both parents have Rh+ blood with the +- genes, they could have children who are ++, +-, or --. In other words, their children could be either Rh positive or Rh negative. Children who are Rh negative can have parents who are either Rh positive or Rh negative.

Two parents who have O positive blood could easily have a child who is O negative. In fact, most children who are O negative have parents who are positive, since the +- combination is so much more common than the -- combination.

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Jaunita Hand

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3y ago

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Related Questions

Can parents with AB positive and A negative blood have a baby with 0 negative blood?

Yes


When Parents with b positive and o positive blood have baby with o negative blood group?

I'll wait for you to ask the question. Positive parents can have a negative baby as positive is dominant so they may both have one positive and one negative gene and the baby gets the two negative genes.


Can a baby be born with positive blood if both parents have negative blood?

No, it is not possible.


Can two parents with A positive blood have an Rh A negative baby?

not chance,but rarely can be.


What blood type can a baby be if the father and mother are both type B positive?

A baby can be any blood type that is possible through the combination of the parents' genetic material. In this case, the baby could be blood type B positive like the parents, or it could be blood type O positive if both parents are carriers of the O blood type gene.


What are parents blood group with their first baby is of blood group o negative?

If the first baby has blood group O negative, it means that both parents must have passed on an O gene and a negative Rh factor gene to the baby. Therefore, the parents could have blood groups A, B, AB, or O with negative Rh factor.


How can a baby have b negative blood when both parents are b positive?

If both parents have Type B blood the only blood type the child can have is either B or O not looking at whether one of the parents is negative or not.


What will two negative parents have positive or negative baby?

a negative times a negative is a positive so the answer is positive


If a mother has a positive blood and father has o positive blood can the baby have ab negative blood?

it it possible if someone from either parents' family has had it or haves it because of genes


If you have A positive blood and your baby has O negative blood does that mean the father of your child would have to have negative blood?

no, he has at least one - but the other half could be + or - if baby is -- then both parents gave - meaning they both are one of these +- or --


Can a O negative parent and an RH O negative parent make a positive baby?

No, if both parents are O negative (meaning they do not have the Rh antigen), they cannot have a Rh positive baby. RH positive blood type requires the presence of the Rh antigen when processing blood types.


Can a mother with A positive blood and father with O positive blood have a baby with A negative blood?

Yes, it is possible for a mother with A positive blood and a father with O positive blood to have a baby with A negative blood. The baby would inherit one A allele from the mother and one O allele from the father, resulting in A negative blood type.