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Identical twin studies are a useful mechanism for assessing the role of genes and environment. Twin studies have also found that among twins with differing sexual orientations, homosexual twins were significantly more gender nonconforming than their heterosexual co-twin, and that this was noticeable from a young age. [29] Bailey states:
Of the pairs of identical twins in which one twin is homosexual, the other twin, despite having the same genome, only has a 20-50% chance of being homosexual as well. [12] This leads to the hypothesis that homosexuality is created by something else rather than the genes.
Bailey carried out early twin studies on homosexuality, finding higher rates of concordance for sexual orientation in identical twins than fraternal twins, suggesting genes or shared prenatal environment have influence on sexual orientation. [17]: 88 Bailey has argued that male sexual orientation appears unaffected by socialization.
In 1979, Thomas J. Bouchard began to study twins who were separated at birth and reared in different families. He found that an identical twin reared away from his or her co-twin seems to have about an equal chance of being similar to the co-twin in terms of personality, interests, and attitudes as one who has been reared with his or her co ...
Image credits: anothermegan #3. Me and my twin are complete opposites. I have a pixie cut and she has long hair. I am a musician and she is a mathematician. I am gay and she is straight.
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In 2013, a twin study combined a survey of pairs of twins where one or both had undergone, or had plans and medical approval to undergo, gender transition, with a literature review of published reports of transgender twins. The study found that one third of identical twin pairs in the sample were both transgender: 13 of 39 (33%) monozygotic or ...
Image credits: Dr.Bahman Guyuron/American Society of Plastic Surgeons This effect was visible in identical twins Brenda and Barb, who were 52 at the time of the study. “I love being called the ...