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Balanced polymorphism refers to the maintenance of two or more genetically distinct forms, or alleles, within a population at relatively stable frequencies over many generations. In human genetics, it is an important concept because it explains why certain alleles that may have harmful effects are nevertheless retained in human populations. The persistence of such genetic variation generally results from natural selection acting in a way that gives some advantage to individuals carrying particular combinations of alleles. One of the most __________ ___ _____ ____ _______ _____.
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