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 1

THIS IS ENOUGH TO TELL THAT THE BLOOD GROUP o is the dominant. as though the A blood group was present it did not express it's charecterstic trait in the off spring. so O is dominant

Answer 2

$\mathfrak{\huge{\red</h2><h2>{\underline{\underline{Answer:-}}}}}$

The dominance of a trait is tested over at least 3 generations. In the above discussed situation, data from only two generation is given. Hence it cannot be concluded which blood type is dominant.