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The effect is an example of a non-genetic influence on male sexual orientation occurring in the prenatal environment. [23] The effect does not mean that all or most sons will be gay after several male pregnancies, but rather, the odds of having a gay son increase from approximately 2% for the first born son, to 3% for the second, 5% for the ...
The relationship between biology and sexual orientation is a subject of on-going research. While scientists do not know the exact cause of sexual orientation, they theorize that it is caused by a complex interplay of genetic, hormonal, and environmental influences.
Homosexuality is sexual attraction, romantic attraction, or sexual behavior between members of the same sex or gender. [1][2][3] As a sexual orientation, homosexuality is "an enduring pattern of emotional, romantic, and/or sexual attractions" exclusively to people of the same sex or gender. [4] It "also refers to a person's sense of identity ...
However, environmental influence does not automatically imply that the social environment influences or contributes to the development of sexual orientation. There is a vast non-social environment that is non-genetic yet still biological, such as prenatal development, that likely helps shape sexual orientation. [17]: 76
Xq28. The human X chromosome with Xq28 (green) located at the tip of the long arm of the chromosome. Studies of the X chromosome as well as the entire human genome have linked Xq28 to the heredity of homosexuality in human males. Xq28 is a chromosome band and genetic marker situated at the tip of the X chromosome which has been studied since at ...
e. Epigenetic theories of homosexuality concern the studies of changes in gene expression or cellular phenotype caused by mechanisms other than changes in the underlying DNA sequence, and their role in the development of homosexuality. [1][2][3] Epigenetics examines the set of chemical reactions that switch parts of the genome on and off at ...
The American Psychological Association states that "sexual orientation is not a choice that can be changed at will, and that sexual orientation is most likely the result of a complex interaction of environmental, cognitive and biological factors...is shaped at an early age...[and evidence suggests] biological, including genetic or inborn ...
Human sexuality. Human sexuality is the way people experience and express themselves sexually. [1][2] This involves biological, psychological, physical, erotic, emotional, social, or spiritual feelings and behaviors. [3][4] Because it is a broad term, which has varied with historical contexts over time, it lacks a precise definition. [4]