The relationship of genotype to phenotype is rarely as simple ... in the human ABO blood group system. Many blood proteins contribute to blood type (Stratton, 1952), and the ABO protein system ...
This system categorises blood into four main types: Type A: Has A antigens on the RBCs and anti-B antibodies in the plasma. Type B: Has B antigens on the RBCs and anti-A antibodies in the plasma.
The term "phenotype" refers to the observable physical ... such as levels of hormones or blood cells.