Question

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

Answer 1

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Blood group A for men recessive trait

Blood group ? for woman recessive trait

to get daughter with blood group O ..

Answer 2

Given information is not enough to tell us which characteristics are dominant –blood group A or O. Blood type A is always dominant in ABO blood and blood type O is always recessive. Here, the father’s blood group may be genotypically AA (homozygous) or AO (heterozygous), whereas that of mother can be OA or OO.