Imagine a woman with blood type AB marries a man of blood ty

Imagine a woman with blood type AB marries a man of blood type A. The man\'s mother is blood type O. A. List all the possible blood types (i.e. phenotypes) that their offspring could have: B. Of the possible blood types, which is the most likely to occur in their offspring?

Solution

Answer to Question A:

Possible genotypes for Type A are AA and AO. But since the mother is blood type O, therefore the man must necessarily be AO genotype. So, the cross between the man and women is as below:

Possible blood types (i.e. phenotypes) that offspring could have: A, AB, B.

Answer to Question B:

Of the possible genotypes, AA and AO can both result into the same phenotype i.e. blood type A, while only the other 2 phenotypes – blood types AB and B – have only one genotype from which to arise, i.e AB and BO respectively. So, probability that of blood type A could result is higher (i.e. 2/4=1/2=0.5) than the probability of each of the other two occurring.

Blood type most likely to occur in the offspring is A.

	A	O
A	AA	AO
B	AB	BO