A man with blood group A marries a woman 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?
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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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