The Genetics of Human Sexual Preference
The notion that genes play a role in determining sexual preference has been around for a long time, and is now widely accepted. But finding these genes has proved difficult. A paper in 1993 claimed that a gene or genes at the tip of the long arm of the X chromosome (DXS52 locus) could be involved in at least some instances of male homosexuality, but attempts to identify this gene, if it exists, have not been successful. It is difficult to understand the basis on which genes predisposing to homosexuality could have been selected evolutionarily. Attempts to trace genes affecting sexual preference in animals have not been successful, because it is not clear that a true analog of homosexuality as we understand it in humans exists in animals.
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