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:

Step1: Determine Mary's genotype

Mary has type A blood. Her genotype can be \(I^AI^A\) (homozygous) or \(I^Ai\) (heterozygous). But since Bill has type AB blood (\(I^AI^B\)), and Bill gets one allele from each parent.

Step2: Analyze the allele from Mary

Since Bill has \(I^A\) from Mary (because Mary has type - A - related alleles). And Bill has \(I^B\) allele which must come from his father.

Step3: Determine father's genotype

If the father is homozygous, and he has to contribute \(I^B\) allele. So his genotype is \(I^BI^B\) (homozygous), which means his blood type is B.

Answer:

B. Option Text