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Part 2 - Dr. This website uses cookies This website uses cookies to improve user experience. The result also indicates that number of pregnancies, mothers of gay sons, particularly those with older brothers, had significantly higher anti-NLGN4Y levels than did the control samples of women, including mothers of heterosexual sons. But that was nothing more than a blip in the road. However, this difference was not hypothesized a priori, was not large, and was the only group difference found out of many tested. Women showed a statistically non-significant trend to weaker influence of hereditary effects, while men showed no effect of shared environmental effects.

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Biology and sexual orientation

Biometric modeling revealed that, in men, genetic effects explained. She is not associated with any organisation that would benefit from this article. A study, Garcia-Falgueras and Swaab asserted that "the fetal brain develops during the intrauterine period in the male direction through a direct action of testosterone on the developing nerve cells, or in the female direction through the absence of this hormone surge. The hypothesis is consistent with other studies on homosexuality, which show that it is more prevalent amongst both siblings and twins. Implications for the Kin Selection Hypothesis".

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The previous research also indicated that grave disease had been seen more in gay men than in straight men. This result LeVay concluded, "suggests that sexual orientation has a biological substrate". Bem sought support from published literature but did not present new data testing his theory. Three gene finding studies showed that gay brothers share genetic markers on the X chromosome; the most recent study also found shared markers on chromosome 8. But this is an absurd way to look at desire.

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