* IBIB: This genotype means the person inherited the IB allele from both parents.

* IBi: This genotype means the person inherited the IB allele from one parent and the i allele from the other parent.

The i allele is recessive, meaning that it only expresses itself if a person inherits two copies of it. In the case of IBi, the IB allele is dominant, so the person will have type B blood.