What is the percent chance that a child with AB blood type can be born to a

father with O blood type and a mother with AB blood type?

A child with AB blood type can be born to a father with O blood type and a mother with AB blood type with a 0% chance.

The AB blood type is only possible if the individual inherits an A allele from one parent and a B allele from the other parent. However, the O blood type is characterized by having two O alleles. Since the father with O blood type does not possess an A or B allele to pass on to the child, it is not possible for the child to have AB blood type in this scenario.