If a man who is heterozygous for blood type A marries a woman who is heterozygous for blood type B, what is the predicted phenotypic ratio of their offspring?

Blood types: AB, A, B, and O in ratio 1:1:1:1

Explanation:

The ABO blood group system is employed in Humans. The alleles for blood type A (A) and blood type B (B) are dominant over the allele for blood type O (O).

If a man who is heterozygous for blood type A (AO) marries a woman who is heterozygous for blood type B (BO), the following gametes will be produced by each parent:

AO - A and O

BO - B and O

Using these gametes in a punnet square, the following proportions of offsprings will be produced:

Blood type AB - 1/4

Blood type A - 1/4

Blood type B - 1/4

Blood type O - 1/4

answer; both surfaces of the membrane are nonpermeable