Based on the ABO blood type chart, if a mother has AB blood type and the father has A blood type, their child can have either A or B blood type, but not AB or O blood type. This is because the mother has both A and B antigens on her red blood cells, while the father has only A antigens. Therefore, the child can inherit either the A antigen from the father or the B antigen from the mother, resulting in either A or B blood type. However, it is not possible for the child to inherit AB blood type because the father does not have the B antigen, and it is not possible for the child to inherit O blood type because both parents have at least one dominant A or B allele.