Question

A man with 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 0 - is dominant? Why or why not?​

Answer 1

The give information is not enough to tell us which of the traits – blood group A or O – is dominant. In blood heredity, blood Type A is always dominant and blood Type O is always recessive. Here, father's Blood group can be AA (homozygous) or AO (heterozygous) genotypically, where as that of mother can be OA or OO.

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Answer 2

Answer:

according today's the blood group O obviously dominant as child was of blood group O