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
The Evolution of Beauty that was adapted from "The Evolution of Beauty", stating that it is "both erroneous and confusing, for it misrepresents sexual selection, natural selection, and modern evolutionary theory." He later described the book as a "mixed bag" but stated that the bad parts outweighed the good, and stated that Prum's arguments were "tendentious". Evolutionary biologists Gerald Borgia and Gregory Ball state that Prum misrepresents opposition of scientists to the model of runaway selection and that he fails to make a case for its ubiquity. Further, they claim Prum inappropriately injects politics into biology, conflating eugenics and genocide with female mate choice