Practice question

Question

According to Hamilton’s Rule, an altruistic act will spread in a population due to kin selection, when B/C > 1/r , where B is the benefit to the recipient, C is the cost to the actor and r is the genetic relatedness of the recipient to the actor. Given this relationship, a human may forego producing one of her own offspring to help her full sibling raise offspring, only if it results in at least ______ or more extra offspring produced by her sibling.