An individual with type A blood and an individual with type B blood mate and have offspring. What blood type is not possible in their offspring?

a) Type O

b) Type A

c) Type B

d) Type AB

e) All blood types are possible

E (All blood types are possible)

Explanation:

The ABO blood group system in humans is a vivid example of co-dominance, where blood type A and B are codominant but are both dominant over blood type O.

Based on this genetic scenario, A codominant blood type AB can be produced, Blood type A can possess AA and AO, Blood type B can possess BB and BO, while Blood type O can only possess OO.

Hence, in a cross between a type A individual - AO or AA and a type B individual - BO and BB, gametes will be produced according to Mendel's law of segregation.

AO, AA (Type A) = A and O gametes.

BO, BB (Type B) = B and O gametes.

Hence, from the combination of these gametes, their offsprings can possess AB, AO, BO, OO which covers all the blood types.

Therefore, all blood types are possible