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Answer:
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
