Question : A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits blood group A or O is dominant? Why or why not?

Question : A man with blood group A marries a woman with blood group O

1.	Question : A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits blood group A or O is dominant? Why or why not?
Answer» Solution :The information is insufficient to TELL whether the trait - .A. or .O. is DOMINANT. In case I let us assume that trait .A. is dominant. Then father may have `I^(A)I^(A) or I^(A)I^(O)` and mother `I^(O)I^(O)` . In this case, 50 per cent of the progeny will have blood group A and 50 PERCENT of the progeny will have blood group O, when father.s blood group is A and mother.s is O. In case II, let us assume that trait .O. is dominant. In this case also, we SEE that child may have blood group O. SINCE, in both the assumptions the child can have blood group O so, we cannot establish which trait is dominant.