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?


The dominance of a trait is tested over at least 3 generations. In the above discussed situation, data from only two generation is given. Hence, it cannot be concluded which blood type is dominant.

  • The A, B, and ABO blood groups are dominant in human genetic characteristics, while the O blood group is recessive.
  • However, in the example above, we are unable to determine which blood group is dominant.
  • Genotypes would be homozygous AA or heterozygous AO if the father’s blood group is A.
  • Women with blood group O would have homozygous OO genotypes and heterozygous AO genotypes.

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