A and O blood type children are what blood type

In the ABO blood group system, it can be divided into A blood type, B blood type, AB blood type and O blood type. Among them, the child born of A and O blood type is A blood type or O blood type, and there is no other possibility. ab is a dominant gene, o is a recessive gene, so after combination, there are only two possibilities: A blood type or O blood type.