Unit of selection and Confirmation of Evolutionary Theory" provides a basic "philosophical" introduction to the debate. Below, cases of selection at the genic, cellular, individual and group level from within the multi-level selection perspective are presented and discussed. George C. Williams in his influential book "Adaptation and Natural Selection" was one of the first to present a gene-centered view of evolution with the gene as the unit of selection, arguing that a unit of selection should exhibit a high degree of permanence. Richard Dawkins has written several books popularizing and expanding the idea. According to Dawkins, genes cause phenotypes and a gene is
Group Selection (book) Group Selection (book) Group Selection is a 1971 book edited by George C. Williams, containing papers written by biologists arguing against the view of group selection as a major force in evolution. The group of biologists writing on a single unified (if somewhat broad) theme contrasts with Williams' earlier seminal 1966 book "Adaptation and Natural Selection", whose arguments Williams suspected to be his alone. In particular it contains a reprint, with an erratum, of W.D. Hamilton's classic 1964 paper on inclusive fitness, "The Genetical Evolution of Social Behavior" plus a paper by John Maynard Smith entitled "The Origin and Maintenance