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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? - Science

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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No. There are two possibilities:
Case I: If the father's blood group is A, and is the dominant trait, his genotypes will be IAIA and IAIO ; and the mother's blood group O being a recessive trait, her genotype will be IOIO​. So, the daughter can receive one recessive allele IO from the father and another from the mother to have genotype IOIO and the blood groupO.
Case II: If the father's blood group A is a recessive trait, his genotype will be IAIA ; the mother's blood group O being a dominant trait, her genotype will be IOIO​ and IOIA. So, the daughter can receive one dominant allele IO from the mother and one recessive allele IA from the father to have genotype IOIA and blood group O.

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Lakhmir Singh Class 10 Biology (Science)
Chapter 4 Heredity and Evolution
Q 75 | Page 195
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