Is it possible that father is having blood group O+ mother is having AB+ and their child has O+ blood group?
No. The chances of blood group O+ in a child born to parents having blood group AB+ and O+ is Zero.
Chances of blood group of child born to these parents would be 50% A or 50% B.But it will never be O or AB.
Chances of blood group of child born to these parents would be 50% A or 50% B.But it will never be O or AB.