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
Unnatural Selection: Why the Geeks Will Inherit the Earth have geek-like powers, fostering a cognitive arms race’. ‘For the first time in human history,’ Roeder wrote, ‘humans will have the capacity to chart their own evolution - as the process of Darwinian natural selection is superseded by unnatural selection.’ He warns that 'human enhancement technologies will eventually threaten our sense of identity as human beings.' Steve Silberman, an editor of "Wired" magazine, wrote that Unnatural Selection ‘is a provocative book that explains why (geeks) have become a social force driving a new kind of human evolution.’ Author Daniel Wilson suggested that the book ‘paints a compelling picture of human