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

The information is not enough to infer that which trait - blood group A or O is dominant.

1 If A is considered to be dominant over O possible combination are male- AO and female OO. Thus, daughter can be OO and hence have blood group O.
2 If O is supposed to be dominant over A then the possible combinations are male- AA, female OO or OA. Thus, daughter can be OA and hence has blood group O.
From the given information we cannot ascertain which blood group is dominant.
http://www.onlinetest.radicesolutions.com/Solved_Problems/Biology/Heridity/Heridity3.html

Answer 2

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