Final answer:
Yes, an individual with blood type O could be a child of parents with blood types A and B.
Step-by-step explanation:
Yes, an individual with blood type O (genotype ii) could be a legitimate child of parents in which one parent had blood type A and the other parent had blood type B.
Blood type O is a recessive trait, which means that it only shows up when both parents pass on an O allele to the child. If one parent has blood type A (genotype IAi) and the other parent has blood type B (genotype IBi), they can pass on the recessive O allele to their child, resulting in a child with blood type O (genotype ii).
Therefore, it is possible for a child with blood type O to have parents with blood types A and B.