If Parents Had Blood Group (o) And (b) Will The Child Have Blood (ab) Group?


5 Answers

Anonymous Profile
Anonymous answered
If the mother is AB+ blood group and the father is O+ blood group, what will the childrens blood group be?
Julii Brainard Profile
Julii Brainard answered
No, well, not unless there was a serious mutation when the offspring was formed as an embryo. Because neither parent has an A allele, and O is entirely recessive. To get offspring with blood type O, that person has to inherit a type O allele from each of their parents. So the person with type O blood can only pass on type O alleles to their chidlren -- not A.

To get type B, the person must have received two type B alleles from their parents, or one type B allele, and one type O (type B is dominant). So again, no A in sight to pass on.

AB blood type occurs when one of the parents had a type A allele, and one parent had a type B allele. People only have two alleles to choose from when having offspring, and their offspring only get one from each parent.

If one of the parents had a type AB blood and the other parent had type O, there is a chance that their child could have type AB if there was crossover from the maternal alleles; this would be very rare, though.
Kyoko Katayama Profile
Kyoko Katayama answered
If a parent has O blood type, his or her offspring cannot be AB blood type  The offspring of these two parents can only be O or B blood type.
Anonymous Profile
Anonymous answered
[There are three genes for blood group. They are all written I (capital I), and then a superscript letter of whichever group it codes for. For example, for the O gene, it would be written as I, and then what looks like a degrees sign after it. As this is bothersome to type, I will say 'A gene' etc. The A gene and the B gene are 'codominant'. That is to say, neither dominates over the other. In other words, If both are present in the child, the child will have AB blood. Both A and B genes dominate over the O gene, so if a child has A and O genes or B and O genes, it would be of A blood or B blood respectively.]

Let's say the father is the O and the mother is the B.

As the O gene is recessive two of them are needed to produce an O blood group phenotype (a phenotype is a characteristic).
As the A and B genes are co-dominant, to produce a B blood group phenotype, two B genes are needed.

As there is not an A gene in either of the parents, and at least one is necessary to produce an AB child, the child will not be of the AB blood group.

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