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Other articles where Indirect fitness is discussed: kin selection: …and reproduction of relatives (indirect fitness). Kin selection occurs when an animal engages in self-sacrificial behaviour that benefits the genetic fitness of its relatives. The theory of kin selection is one of the foundations of the modern study of social behaviour. Other articles where Direct fitness is discussed: kin selection: …individual survival and reproduction (direct fitness) and any impact that an individual has on the survival and reproduction of relatives (indirect fitness). Kin selection occurs when an animal engages in self-sacrificial behaviour that benefits the genetic fitness of its relatives. best fitness apparel brands for men_3149_20191123212044 Learn fitness ap biology with free interactive flashcards. Choose from 500 different sets of fitness ap biology flashcards on Quizlet. Fitness biology definition . In biology, it refers less to how healthy an individual is, and more to the number of b