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In humans, the ABO blood type is controlled by a single gene with three possible alleles....

In humans, the ABO blood type is controlled by a single gene with three possible alleles. Allele IA codes for blood type A and is co-dominant to allele IB which codes for blood type B. Allele i is recessive to the other two and codes for blood type O. A man of blood group O marries a woman of blood group A.  The wife's father is blood group O.  What is the probability that their children will have blood group O?

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