What are the the blood type phenotype?

Blood type phenotypes refer to the observable characteristics of an individual's blood, primarily determined by the presence or absence of specific antigens on the surface of red blood cells. The main blood type phenotypes are A, B, AB, and O, which correspond to the presence of A antigens, B antigens, both A and B antigens, or neither (respectively). Additionally, each blood type can be classified as Rh-positive or Rh-negative based on the presence of the Rh factor. This results in eight possible blood type phenotypes: A+, A-, B+, B-, AB+, AB-, O+, and O-.