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?

We cannot determine which blood group A or O’s traits are more prevalent based solely on the information provided. When it comes to ABO blood, blood type A is always dominant and blood type O is always recessive. Here, the mother’s blood group may be OA or OO, whereas the father’s blood group could be homozygous AA (homozygous) or heterozygous AO (heterozygous).