Gary John Norman Getty Images Advertisement The reasons behind why people are gay, straight or bisexual have long been a source of public fascination. Indeed, research on the topic of sexual orientation offers a powerful window into understanding human sexuality. Among the indigenous Zapotec people in southern Mexico, individuals who are biologically male and sexually attracted to men are known as muxes. They are recognized as a third gender: Muxe nguiiu tend to be masculine in their appearance and behavior; muxe gunaa are feminine. In Western cultures, they would be considered gay men and transgender women, respectively.
These DNA differences may be linked to having same-sex partners | Science News
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.
Gender and Genetics Gender, Sexual Orientation, and Behavioural Genetics Behavioural genetics research aims to determine the role genes may play in shaping human behaviour. Genetically determined behaviour in fruitflies The elaborate courtship ritual of fruitflies is a unique experimental system in which to examine the basis of genetically programmed behaviour relating to gender. The sexual behaviours of Drosophila melanogaster are complex, robust, and are displayed by only one sex males. Demir and Dickson have recently imposed female splicing of the gene in male flies, which resulted in a loss of male courtship behaviour and orientation.
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