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?
B
O AB
0

Answer 1

B, Bill has blood type B) on edge 2020

Answer 2

Bill's dad has blood type B

Explanation:

See punnet squares attached

It's given that the dad's blood type is homogenous -> the two letters must be the same. So we can eliminate AB, we have B and O as the options left

If the dad's blood type is O, using punnet square, we can figure out that it then would be impossible for Bill to have blood type AB (AO = blood type A) --> Incorrect

If the dad's blood type is B, using punnet square, we see that the probability that Bill has blood type AB is 100%