According to this theory, an organism is reproductively fit not only to the extent that it can survive and reproduce, but also to the extent that it passes on its genetic line to new generations.

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The theory of inclusive fitness extends the concept of evolutionary success beyond an individual's own offspring to include the genetic success achieved by helping close relatives (who share many of the same genes) to reproduce. This theory explains behaviors that may not directly benefit the individual but benefit the genetic lineage, such as altruism among kin.

According to This Theory, an Organism Is Reproductively Fit Not