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The 1993 study by Hamer et al. examined 114 families of gay men in the United States and found increased rates of homosexuality among maternal uncles and cousins, but not among paternal relatives. This pattern of inheritance suggested that there might be linked genes on the X chromosome , since males always inherit their copy of the X ...
Gay men report, on average, slightly longer and thicker penises than non-gay men. [134] The average size of the INAH 3 in the brains of gay men is approximately the same size as INAH 3 in women, which is significantly smaller, and the cells more densely packed, than in heterosexual men's brains. [47]
The idea of epigenetics and gene expression has been a theory applied to the origins of homosexuality in humans. One team of researchers examined the effects of epi-marks buffering XX fetuses and XY fetuses from certain androgen exposure and used published data on fetal androgen signaling and gene regulation through non-genetic changes in DNA ...
[10] [12] Scientists have estimated that 15–29% of gay men owe their sexual orientation to this effect, but the number may be higher, as prior miscarriages and terminations of male pregnancies may have exposed their mothers to Y-linked antigens. In addition, the effect is nullified in left-handed men.
This effect is estimated to account for between 15-29% of gay men, while other gay and bisexual men are thought to owe sexual orientation to genetic and hormonal interactions. [ 26 ] [ 23 ] Socialization theories, which were dominant in the 1900s, favored the idea that children were born "undifferentiated" and were socialized into gender roles ...
Lesbian, gay, bisexual, transgender, and queer/questioning people (LGBTQ community) people wishing to have children may use assisted reproductive technology.In recent decades, developmental biologists have been researching and developing techniques to facilitate same-sex reproduction.
Three hundred love letters written during WWII were discovered in a trunk and tell the story of a forbidden love between two gay men.
The Science of Desire: The Search for the Gay Gene and the Biology of Behavior is a 1994 book by the geneticist Dean Hamer and the journalist Peter Copeland, in which the authors discuss Hamer's research into the genetics of homosexuality. The book received both positive and mixed reviews.