If one parent has AB and one parent has O blood types, what are the possibilities of blood types for their children

To determine the possibilities of blood types for children, we need to understand how blood types are inherited. The ABO blood type system is determined by the presence or absence of antigens on the surface of red blood cells. There are four blood types: A, B, AB, and O.

Each person inherits one blood type allele from each parent. The alleles for blood types fall into three categories: A, B, and O. The A and B alleles are co-dominant, meaning if both are present, they both express themselves equally. The O allele is recessive, meaning it will only be expressed if both A and B alleles are absent.

In the given scenario, one parent has blood type AB (which means they have both A and B alleles), and the other parent has blood type O (which means they have two O alleles).

The possibilities of blood types for their children can be found by combining the alleles of the parents. Since the A and B alleles are co-dominant, if one parent passes an A allele and the other passes a B allele, the child will have blood type AB. If the O allele is passed from either parent, the child will have blood type O.

Therefore, the possibilities for blood types of their children are:
- 50% chance of blood type AB
- 50% chance of blood type O

Keep in mind that this is a simplified explanation, as other genetic factors can influence blood type inheritance. An individual's blood type can be confirmed through proper testing.