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In biology, an atavism is a modification of a biological structure whereby an ancestral genetic trait reappears after having been lost through evolutionary change in previous generations. An atavism is the phenomenon in which a phenotypic trait reappears in an organism after a period of absence. All the members of the species have the features, but an atavism was described as the occasional reappearance. This phenomenon is called atavism—the reappearance of a trait that has been lost during.