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Serological criteria for racial classification focus on the study of blood groups and other biochemical markers in human populations to understand genetic variations. This approach emerged in the early twentieth century with the discovery of blood groups such as ABO by Karl Landsteiner, which showed that populations differ in the frequency of specific blood group alleles. Later, other systems _______ ________ _________ ______ _____ ___ _____ _________ ______ ___ ______ ___.
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