Blood Group

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?

Which of the statements given below are correct? 1. A person having blood group 'A' can donate blood to persons having blood group 'A' and blood group AB'. 2. A person having blood group 'AB' can donate blood to persons having blood groups 'A', 'B', 'AB' or 'O'. 3. A person with blood group 'O' can donate blood to persons having any blood group. 4. A person with blood group 'O' can receive blood from the person of any of the blood groups. Select the correct answer using the code given below:

According to the ABO system , the commonest blood group in the human population is (X) while the rarest blood group is (Y) . If the wife has (X) blood group and the husband has (Y) blood group , their children will have which of the following blood groups ?