If your father has blood type O, and mother has blood type AB, which of the following blood types are you likely to have?
Either A or B
If the father’s blood group is O, he has the genotype IOIO or (ii) . The mother has blood type AB, which means that her genotype would be IAIB. The possible combinations of these two groups would result in children having genotypes IAIO or IBIO, which would give them blood groups A or B respectively. Thus, blood group O cannot appear among children if one of the parents has the group AB.