In other species: cattle , goat , pig , sheep , , aoudad , chicken

Mendelian trait/disorder: yes

Mode of inheritance: Autosomal Co-Dominant

Considered a defect: no

Key variant known: no

Cross-species summary: Each blood group system consists of a set of blood types, each of which corresponds to a particular antigen (usually a glycoprotein) on the surface of red blood cells. The different types within a system are the result of the action of different alleles at a locus that usually encodes an enzyme that catalyses the creation of the feature of the glycoprotein unique to that type, e.g. the presence of a particular sugar at the end of a short chain of sugars.

Inheritance: Law et al. (1965) presented evidence of three loci (systems), namely the A locus with 5 alleles; the C locus with at least 3 alleles; and the F locus involving at least 3 alleles. Three years later, four additional loci (J, K, L, and Q) had been discovered (Stevens and Admunson, 1968).