Question

mary has type a blood. her son bill has type ab blood. which blood type does bills dad have if he is homogenous for blood type?
a
b
ab
o

Explanation:

Blood type is determined by alleles. Mary has type A blood, so her genotype is either \(I^AI^A\) (homozygous) or \(I^Ai\) (heterozygous). Bill has type AB blood (\(I^AI^B\)). Since Bill gets one allele from each parent, and Mary can only contribute an \(I^A\) (because if she was \(I^Ai\), she could give \(i\), but Bill has no \(i\) as he is AB. So Bill's \(I^B\) must come from his father. If the father is homozygous, his genotype is \(I^BI^B\), which means his blood - type is B.

Answer:

B. Option Text