Others will prefer activities that are typical of another gender. In Dean Hamer and colleagues published findings from a linkage analysis of a sample of 76 gay brothers and their families. Roselli et al. The hypothesis is consistent with other studies on homosexuality, which show that it is more prevalent amongst both siblings and twins. Most of the data suggests that homosexual rams, like female-oriented rams, are masculinized and defeminized with respect to mounting, receptivity, and gonadotrophin secretion, but are not defeminized for sexual partner preferences, also suggesting that such behaviors may be programmed differently. InNature published an article with a genome wide association study on male sexual orientation.
Retrieved 20 March
J Pers Soc Psychol. The HIV-positive people in the presumably heterosexual patient groups were all identified from medical records as either intravenous drug abusers or recipients of blood transfusions. Gay brothers who showed this maternal pedigree were then tested for X chromosome linkage, using twenty-two markers on the X chromosome to test for similar alleles.
Archived from the original on 16 June