Pat's has type A blood & his mom has type O blood, the blood type of his dad must be the type AB blood. One of the parent must possess at least of copy of the A allele.
For Pat having A type blood to have a mom with type O blood, it means, his genotype for the type A blood is heterozygous IAO. His mom's genotype is OO.
Therefore for a couple with the mom as OO to produce a child with AO, there are two scenarios; the father has to possess either AB or AA
If the father is AA and the mom is OO, their offspring could be all AO from the cross between the two.
A
O AO
If the father is AB and the mom OO, there is also there is also a 50% chance of producing a child with AO
A B
O AO BO
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