There is good but not conclusive evidence that sex is indirectly selected because it facilitates adaptation, and in particular adaptation to coevolving antagonists. Competition for sexual partners leads to characteristic male and female adaptations inconsistent with natural selection. This chapter starts with a section called Evolution of sex and it discusses Calkins' experiment; Muller's Ratchet; artificial selection for recombination; sex and the rate of adaptation; the correlated response to directional selection; the Red Queen; and sib competition. The final subsection is called Somewhat sexual. The second section is called The alternation of generations and is about antagonism of sexual selection and natural selection; vegetative theories of the life cycle; the sexual theory of the life cycle; and sporophyte and gametophyte. The third section, Gender, talks firstly about many genders and then discusses male and female and gamete competition. It also details the gender of individuals and parts; equality under Fisher; gender allocation; homothallism; and finally self-fertilization. The final section here is entitled Beauty and the Beast and discusses Bateman's Principle; artificial sexual selection; sexual contests; male x female interaction; sexual choice; sexual ornaments; and finally includes a subsection called battles of the sexes.
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