Can father O positive and mother negative have daughter w negative?

No, a father with O positive blood type and a mother with O negative blood type cannot have a daughter with AB negative blood type.

Here's the explanation:

- The father has O positive blood type (OO), meaning he has only O alleles for the ABO blood group.

- The mother has O negative blood type (OO), meaning she also has only O alleles for the ABO blood group.

Based on this information:

a) The only possible blood types that their child can inherit are O positive (OO) or O negative (OO) .

b) It is impossible for their child to have A, B, or AB blood types because neither the father nor the mother carries the A or B alleles. (Remember, a child inherits one allele from each parent for each gene)

Therefore, the parents with O positive and O negative blood types cannot have a daughter with AB negative blood type.