Hamilton's rule presents the main difference between group selection and inclusive fitness.

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Hamilton's rule states that altruistic behavior can evolve by kin selection if the benefit to the recipient, weighted by the coefficient of relatedness, is greater than the cost to the actor. This explanation focuses on individual selection and inclusive fitness. Group selection, on the other hand, argues that altruistic behavior can evolve even if it is detrimental to the individual actor if it benefits the group as a whole. Hamilton's rule is a key insight into the mechanics of kin selection and, as such, reveals a major difference between group selection and inclusive fitness.

Hamilton's Rule Presents the Main Difference Between Group Selection and Inclusive