Homosexuality
There is no simple genetic test to differentiate homosexuals from heterosexuals. However, many studies of siblings have consistently found a much higher incidence of homosexuality in pairs of monozygotic (identical) twins compared to dizygotic (fraternal) twins, strongly suggesting a genetic component to homosexuality. Although there is some suggestive evidence linking variation at specific regions of the genome with the propensity for being homosexual, these studies are not yet conclusive.
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