The document provides information about human blood types: - There are 4 main blood types: A, B, AB, and O - The blood types are determined by the presence or absence of antigens (proteins) on the surface of red blood cells called A and B antigens - The genotypes that determine blood types are IA, IB, and i - Blood type A has the A antigen and genotype IAIA or IAi - Blood type B has the B antigen and genotype IBIB or IBi - Blood type AB has both A and B antigens and genotype IAIB - Blood type O has neither antigen and genotype ii Worked examples are provided to demonstrate inheritance of blood types through Punnett