Answer:
If the father has blood group A i.e., 
(homozygous)
and mother has blood group B i.e., 
then
all the offsprings will have blood group 
and
not blood group O.
Child will have blood
group O only when both the parents are heterozygous, i.e., father 
and
mother 
.
Thus the genotypes of
the parents of child with blood group O will be and
.
There is possibility of 3 other types of offsprings besides 0 blood group
offspring. They are (blood
group A), (blood
group B) and 
(blood
group AB).
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