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A man ,Yith blood group A marries a woma...

A man ,Yith blood group A marries a woman with blood group O and their daughter has. blood group 0. Is this information enough to tell you which of the traits - blood group A or O. Is dominant? Why or why not?

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No. This information is not sufficient- to determine which of the traits - blood group A or O - is dominant
This is because we do not about the blood . group of all the progeny. Blood group A can be genotypically AA or AO. Hence, the information is incomplete. For considering a trait as dominant or recessive, we need data of at least three generations to draw any conclusion.
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