Consider a situation in which an offspring helps its parents (degree of relatedness = 0.50), who gain a fitness benefit of 10.According to Hamilton's rule, it would be adaptive for the offspring to help its parents when the fitness cost to the offspring performing the help is

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Hamilton's rule states that an altruistic act is favored by natural selection if the cost to the altruist (C) is less than the benefit to the recipient (B) multiplied by the coefficient of relatedness (r), mathematically represented as rB > C. Here, with a relatedness (r) of 0.50 and a benefit (B) of 10, the condition becomes 0.50 * 10 > C, simplifying to 5 > C. Therefore, it would be adaptive for the offspring to help its parents when the fitness cost to the offspring is less than 5.

Consider a Situation in Which an Offspring Helps Its Parents