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 God said, "In his brilliant new book, “The Evolution of God,” Robert Wright tells the story of how God grew up." Bloom sums up Wright's controversial stance as, "Wright’s tone is reasoned and careful, even hesitant, throughout, and it is nice to read about issues like the morality of Christ and the meaning of jihad without getting the feeling that you are being shouted at. His views, though, are provocative and controversial. There is something here to annoy almost everyone." However, in a "New York Times" review that included a reply from Wright, Nicholas Wade, a writer for the "Science Times"