A man with blood group A marries a women with blood group O & their daughter has blood group O.Is this information enough to tell you which of the trait blood group A or O is dominant ? why or why not?
A man with blood group A marries a women with blood group O & their daughter has blood group O.Is this information enough to tell you which of the trait blood group A or O is dominant ? why or why not?
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.
According to universal law of blood group
If a man has blood group A it may be homozygous (AA) OR heterozygous (AO) as pairs. So, as A is dominating and mother has only OO and blood group O is recessive, then the daughter may have either of blood group O or A.
if A from father crosses with O of mother then blood group of daughter = A(dominating)
but if O from father crosses with O of mother then blood group of daughter = O (as recessive blood group would express only in homozygous condition).
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.
According to universal law of blood group
If a man has blood group A it may be homozygous (AA) OR heterozygous (AO) as pairs. So, as A is dominating and mother has only OO and blood group O is recessive, then the daughter may have either of blood group O or A.
if A from father crosses with O of mother then blood group of daughter = A(dominating)
but if O from father crosses with O of mother then blood group of daughter = O (as recessive blood group would express only in homozygous condition).
