Twins and sexual orientation and genes
The science behind a more meaningful understanding of sexual orientation
8 Oct Scientists find DNA differences between gay men and their straight twin brothers. Could the molecular signals that turn genes on and off reveal a person's sexual orientation? New research identifies epigenomic "marks" linked to homosexuality . But experts say the origins of partner preference remain a.
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homosexuality twin studies - PubMed - NCBI
A number of twin studies have attempted to compare the relative importance of genetics and environment in the determination of sexual orientation. In a study, Bailey and Pillard conducted a study of male twins recruited from " homophile publications", and found that 52% of monozygotic. Eight major studies of identical twins in Australia, the U.S., and Scandinavia during the last two decades all arrive at the same conclusion: gays were not born that way.
“At best genetics is a minor factor,” says Dr. Neil Whitehead, PhD. Whitehead worked for the New Zealand government as a scientific researcher for 24 years.
Description:Twin studies[ edit ] A number of twin studies have attempted to compare the relative importance of genetics and environment in the determination of sexual orientation. Self reported zygosity , sexual attraction, fantasy and behaviours were assessed by questionnaire and zygosity was serologically checked when in doubt. Other researchers support biological causes for both men and women's sexual orientation. Women showed a statistically non-significant trend to weaker influence of hereditary effects, while men showed no effect of shared environmental effects. The use of all adult twins in Sweden was designed to address the criticism of volunteer studies, in which a potential bias towards participation by gay twins may influence the results; Biometric modeling revealed that, in men, genetic effects explained. Corresponding estimates among women were.
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