The Evolution of Cooperation insects, where the workers – which are sterile, and therefore incapable of passing on their genes – benefit the queen, who is essentially passing on copies of "their" genes. This is further elaborated in the "selfish gene" theory of Richard Dawkins, that the unit of evolution is not the individual organism, but the gene. (As stated by Wilson: "the organism is only DNA's way of making more DNA.") However, kinship selection works only where the individuals involved are closely related; it fails to explain the presence of altruism and cooperation between unrelated individuals, particularly across species. In a 1971 paper
The Major Transitions in Evolution The Major Transitions in Evolution The Major Transitions in Evolution is a book written by John Maynard Smith and Eörs Szathmáry (Oxford University Press, 1995). At the time of its publication, Egbert Giles Leigh, Jr reviewing for "Evolution" commented that it "may be the most important book on evolution since [R.A.] Fisher's (1930) "The Genetical Theory of Natural Selection"". Maynard Smith and Szathmary authored a review article in "Nature". Maynard Smith and Szathmáry identified several properties common to the transitions: As stated by the authors, this book was aimed at professional biologists and assumes considerable prior knowledge. They have also