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The use of serological criteria for racial classification represents a method in physical anthropology that utilizes blood group systems and other immunological markers to differentiate between human populations. This approach is based on the observation that certain genetic traits, particularly those found in the blood, vary in frequency across different populations. These variations, although not exclusive or definitive, can provide insights into the genetic relationships and historical patterns of migration, admixture, and evolution of human groups. Serology, the scientific study of serum and other body fluids, particularly with reference to the response of the immune system to pathogens or introduced substances, has contributed to physical anthropology by offering measurable, genetic, and relatively stable biological markers. ### Background and Theoretical Framework The study of blood groups and antigens became prominent in the early 20th century following the discovery of the ABO blood group system by Karl Landsteiner in 1900. Subsequently, other systems such as MN, Rh, Kell, Duffy, and Kidd were discovered. These systems are based on the presence or absence of antigens on the surface of red blood cells. As these antigens are genetically determined and inherited in a Mendelian fashion, they provide valuable data for understanding population genetics and biological diversity. Physical anthropologists began incorporating serological data into racial classification schemes in the mid-20th century, complementing morphological and metric data. This was part of an effort to identify biological patterns in human populations that might reflect common ancestry or evolutionary history. While modern anthropology has largely moved away from typological ___ _______ _______ ________ _______ _______ _____ _______ ________ ___.
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