A father has blood group A and mother has blood group B ,What will be the possible blood group of the progeny ?

AB A, B, AB, and O. Only O Only A and B .

A, B, AB, and O.

Due to codominance of "IA" and "IB” alleles, the genotype "IAIB" produce “AB” blood group respectively. Thus, the six genotypes give total four phenotypes. Hence, parents with A and B blood group can have child with A, B, AB and O blood groups.