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?​

Answer 1

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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?

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

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Answer 2

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☃️ The given information is not enough to determine the traits- blood group A or O is dominant .

☃️ In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive .

☃️ Here the father's blood group is A hence, it can either be homozygous (AA) or heterozygous (AO) .

☃️ The mother's blood group is O and it is only possible if it is heterozygous (OO).

☃️ For the daughter to have blood group O the father must be heterozygous (AO) and mother must be (OO) .