What is the meaning of blood group in human?
Answers
The term human blood group systems is defined by International Society of Blood Transfusion as systems in the human species where cell-surface antigens—in particular, those on blood cells—are "controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them",[1] and include the common ABO and Rh (Rhesus) antigen systems, as well as many others; thirty-five major human systems are identified as of November 2014.[2]
In addition to the ABO and Rh systems, the antigens expressed on blood cell membrane surfaces include 346 red blood cell antigens and 33 platelet antigens, as defined serologically.[3][better source needed] The genetic basis for most of these antigens lie in 46 red blood cell and 6 platelet genes.[citation needed] An individual, for example, can be AB RhD positive, and at the same time M and N positive in the MNS system, K positive in the Kell system, and Lea or Leb positive in the Lewis system,[citation needed] where these and many of the systems are named for patients in whom the corresponding antibodies were first detected.[citation needed]