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

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.

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