A new group-selection model for the evolution of homosexuality

Biology and Philosophy 18 (5):683-694 (2003)
Abstract. Scientists have long puzzled over how homosexual orientation has evolved, given the assumed low relative fitness of homosexual individuals compared to heterosexual individuals. A number of theoretical models for the evolution of homosexuality have been postulated including balance polymorphism, "Fertile females", hypervariability of DNA sequences, kin selection, and "parental manipulation". In this paper, I propose a new group-selection model for the evolution of homosexuality which offers two advantages over existing models: (1) its non-assumption of genetic determinism, and (2) its lack of dependency on an inefficient altruism relation and family dynamics theory.
Keywords Altruism  Evolution  Genetic determinism  Group selection  Homosexual orientation
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DOI 10.1023/A:1026321628276
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