If the mother has a IV blood group, and the father has a III, then what groups cannot their children have?

If the father is the father is homozygous, then they can have the first and second blood groups. There are four main blood groups in nature, that is, they cannot have the third and fourth blood groups. What are blood types? It is an antigen, a protein that sits on the surface of red blood cells. The rarest blood group on our planet is considered the fourth negative, that is, with a negative Rh factor.