Blood Type Inheritance: Predicting Child's Blood Type with O+ and A- Parents

If the mother has O positive blood type and the father has A negative blood type, it is not possible for them to have a boy child with A negative blood type or a daughter with O negative blood type.

Here's the explanation:

Blood type inheritance is determined by the genes inherited from both parents. Each person has two alleles for the ABO blood type gene, one inherited from each parent. The alleles can be A, B, or O.

The A and B alleles are dominant, meaning that if a person inherits at least one A or B allele, they will have the corresponding blood type (A or B). The O allele is recessive, meaning that a person must inherit two O alleles to have the O blood type.

The mother has O positive blood type, which means she must have two O alleles (OO). The father has A negative blood type, which means he must have one A allele and one O allele (AO).

When the mother and father have children, they will each contribute one allele to the child's blood type. The possible allele combinations are:

- AO (A positive)

- BO (B positive)

- AB (AB positive)

- OO (O positive or O negative)

Based on these possible combinations, it is clear that it is not possible for the couple to have a boy child with A negative blood type or a daughter with O negative blood type.