ans can have red blood cells that are of type A (IA), type B (IB), or type O (i). These three different alleles can be combined in different ways following Mendel's Laws of Inheritance. The resulting genotypes make either type A, type B, type AB, or type O blood. Type A blood is a combination of either two A alleles (IA IA) or one A allele and one O allele (IAi). Similarly, type B blood is coded for by either two B alleles (IB IB) or one B allele and one O allele (IBi). What pattern of inheritance is human blood type?
Human blood type follows a pattern of inheritance known as codominance. This means that both alleles for blood type are expressed in individuals who have a heterozygous genotype (IAi or IBi), resulting in the formation of a third phenotype (AB blood type) rather than a blending of the two alleles.
