In order to predict that a particular altruistic behavior will be directed to a half-sibling, theory suggests that the benefit to the receiver must exceed the cost to the actor by at least ____ times.
A) 2
B) 4
C) 6
D) 8

Question

Quizplus · Accepted Answer

According to Hamilton's rule of kin selection, an altruistic behavior will be favored by natural selection if the cost to the actor is less than the benefit to the recipient multiplied by their coefficient of relatedness. For half-siblings, who share approximately 25% of their genes, the benefit must exceed the cost by at least 4 times (1/0.25 = 4).

In Order to Predict That a Particular Altruistic Behavior Will