Question

A woman with blood group 'O' has a child with blood group `O'. She claims that a man with blood group 'A' as the father of her child. What would be the genotype of the father, if her claim is right?

• A. I${}^B$I
• B. I${}^A$I
• C. I${}^A$I${}^B$
• D. II

Answer 1

Answer: (B)

Genes for blood group are codominant. For AB and B blood group, at least one of the parent should have a gene for B blood group. Similarly, if the blood group of a child is O and mother's blood group is O and when a father with A blood group claims this child then he should be heterozygous at having the genotype for gene A and O.