Discussion
If one of the parents is of O blood group, the blood group of the child cannot be :
Answer: A
The child cannot be AB.
A parent of blood group O has genotype OO and can pass on only an O allele. For the child to be AB, it would need an A allele from one parent and a B allele from the other, which is impossible if one parent can give only O. This is the basis of the exclusion in disputed paternity cases.
The child can be O (O from each parent), A (A from the other parent, giving AO) or B (B from the other parent, giving BO), so those three groups are all possible.
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