Can a mother with A positive blood type and father O produce child 0 negative?

No, a mother with A positive blood type and a father with O blood type cannot produce a child with O negative blood type.

A person's blood type is determined by the antigens present on the surface of their red blood cells. There are two main types of antigens, A and B, which can be inherited from either parent. A person with A positive blood type has the A antigen and the Rh factor (a protein on the surface of red blood cells), while a person with O blood type has neither the A nor the B antigen.

When a mother with A positive blood type and a father with O blood type have a child, the child can inherit either the A antigen from the mother or the O antigen from the father. However, the child cannot inherit the Rh factor from the father, as he does not have it. Therefore, the child can only have A positive, A negative, or O positive blood type.