IF a man with blood type A, one one of whose parents had blood type O, marries a woman with blood type AB, what are the putative genotypes of the offspring?

The 1st child will surely have AA,The 2nd might have AB/OB and the last one will surely have OB

Explanation:

I studied at school like 2 yrs ago

I am sure

If the man has blood type A one of whose parents had blood type O then he must be having the genotype IAi and the woman with blood group AB would have genotype IAIB. So if they produce offspring than the putative genotype of the offspring would be IAIA, IAi, IAIB, and IBi.

Explanation:

                   IA        i

             IA   IAIA   IAi

             IB   IAIB    IBi

Therefore out of four offspring, two offspring would be having A blood group, one offspring would have AB blood group and one offspring would have B blood group.

HOPE THAT HELP YOU :)

ALL THE BEST

i think its the first one