A child with blood group genotype I^AI^B is born to a woman with genotype I^BI^B. The father could not be a man of genotype

Blood grouping is an example of multiple alleles and co-dominance. ABO blood groups are controlled by the gene I. The plasma membrane of the red blood cells has sugar polymers that protrude from its surface and the kind of sugar is controlled by the gene. 

The gene (I) has three alleles I^A , I^B and i.