Question

A Man with Blood Group A marries a woman with blood group O and their daughter has blood group O. Explain why this information is not enough to explain which blood group (A or O) is dominant.

Answer 1

The information is not enough to decide which blood group is dominant.

But universally , blood group A is dominant whereas blood group O is recessive.

case 1: For an A group father it may be homogeneous (AA) or heterogeneous(AO) as pairs.So as A is dominant and  an O group mother, the O group is recessive, then the daughter may have either group O Or A.

If A from father crosses with O of mother then blood group of daughter =A(dominant)

case 2:But if O from father crosses with O of mother then blood group of Daughter=) (as recessive) blood group expressed in homogeneous condition.

Answer 2

INFORMATION IS INSUFFICENT TO TELL