| Abstract: | Change in gene frequency under kin selection is the sum of two components, namely, See equation in the PDF file], a change in gene frequency caused by individual selection, and See equation in the PDF file], a change caused by group selection. For the evolution of altruistic traits by kin selection, See equation in the PDF file] is always negative-that is, individual selection operates against altruism-and See equation in the PDF file] is always positive, so that selection between groups favors altruism. Hamilton's rule specifies the conditions under which See equation in the PDF file]-that is, the conditions necessary for intergroup selection to override individual selection. |
