Distinct molecules called agglutinogens, a type of antigen, are attached to the surface of
red blood cells. There are two types of agglutinogens, type "A" and type "B." Individuals
who inherit two copies of the type "A" allele will only have A agglutinogens. Individuals who
inherit two copies of the type "B" allele will only have B agglutinogens. An individual who
receives the type "A" allele from one parent and the type "B" allele from the other parent
will have both "A" and "B" agglutinogen alleles. The inheritance of an altered nonfunctional
allele for agglutinogens is possible. If an individual inherits two copies of the nonfunctional
allele from their parents, they would have no agglutinogens on the surface of their red
blood cells and would be considered blood type O.

A mother has blood type A, the daughter is O, and the son is B. The father has blood type
B.
Based on the above information:
(A) The father and the mother are expecting their third child. Complete a Punnett square on a
piece of scratch paper to determine the blood type that is impossible for their child to have.
Explain your reasoning.

(B) Identify and explain one non-Mendelian inheritance pattern in blood type.