Gay gene study

Sex differences in humans. In Dean Hamer and colleagues published findings from a linkage analysis of a sample of 76 gay brothers and their families. The Growth of Biological Thought: This hypothesis is an extension of the theory of kin selection , which was originally developed to explain apparent altruistic acts which seemed to be maladaptive. A later analysis by Hu et al. The early fixation hypothesis includes research into prenatal development and the environmental factors that control masculinization of the brain. University of California Press.


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Biology and sexual orientation

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Gay men were divided: The researchers found a significant difference in INAH3 size between heterosexual men and heterosexual women. The biological theories reappraised". Six of these men had died of AIDS-related illnesses. The authors concluded that "our findings, taken in context with previous work, suggest that genetic variation in each of these regions contributes to development of the important psychological trait of male sexual orientation". The perceived causes of sexual orientation have a significant bearing on the status of sexual minorities in the eyes of social conservatives. Proceedings of the National Academy of Sciences.


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Some researchers state that solid scientific support for this is lacking. Results from the first large, comprehensive multi-center genetic linkage study of male sexual orientation were reported by an independent group of researchers at the American Society of Human Genetics in They argue that sexual orientation can shift over the course of a person's life. In a study, its authors stated that "There is considerable evidence that human sexual orientation is genetically influenced, so it is not known how homosexuality, which tends to lower reproductive success, is maintained in the population at a relatively high frequency. A meta-analysis of 48 studies showed childhood gender nonconformity to be the strongest predictor of a homosexual orientation for both men and women. Vasal and VanderLaan provides evidence that if an adaptively designed avuncular male androphilic phenotype exists and its development is contingent on a particular social environment, then a collectivistic cultural context is insufficient, in and of itself, for the expression of such a phenotype.


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