A child with blood group genotype different from those of both parents and with a...

Explanation

This question is asking about the genotype of a child who has a different blood group from both parents, and whose mother has a genotype of OO. The question wants to know what the genotype of the child's father must be. The answer to this question is option D, which is AB. This is because the child's blood group is different from those of both parents, which means that the child must have inherited one allele from each parent that resulted in a different blood group. Since the child's mother has a genotype of OO, she can only pass on an O allele to her child. Therefore, the child must have inherited an A and a B allele from the father to have a blood group that is different from both parents. It is important to note that the ABO blood group system is controlled by multiple alleles, which means that there are more possible blood types than just A, B, and O. The Rh factor is another important blood group antigen that can also be inherited from parents. Understanding genetics and blood groups is important in fields such as medicine and forensic science. By analyzing blood samples, doctors and scientists can determine important information about a person's health and identity.