A man with blood group A marries a woman with

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?

solution:
No, because there is no information about the blood group of all the progenies.Blood group A can be genotypically AA or AO.

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