Question

Mary has type A blood. Her son Bill has type AB blood. Which blood type does Bill's dad have if he is homogenous for blood type?
a. Blood type A
b. Blood type B
c. Blood type AB
d. Blood type O

Answer 1

So since her son, has AB blood type that means that he got one of the alleles (A or B) from his mother and one from his father.

Now since she has Type A blood that means that you can give her son either the A allele or O allele, theoretically. This is because if she is type A, she can either have the genotype: AA or AO. But since her son is AB, she definitely gave the A allele to her son.

Now given that reasoning what do you suppose is the father's type? Now you have to keep in mind that the problem states that the father is homogenous which means he has only one type of allele so if he's A, he AA not AO.

Answer 2

Okay, so If the son received the A allele from his mother, he had to have received the B allele from his father then. Right? @1DEA

Answer 3

yes!

Answer 4

okay, thank you :)

Answer 5

no problem