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"The available science analyzing the human genome clearly says there is no genetic basis for a homosexual identity. A large-scale study of the human genome concluded there is certainly no single genetic determinant of same-sex sexual behavior. The study concluded that “all tested genetic variants accounted for 8% to 25% of variation in same-sex sexual behavior … and do not allow meaningful prediction of an individual’s sexual behavior.” The lead author of the study told The New York Times that it is “basically impossible to predict one’s person’s sexual activity or orientation just from genetics.” Ruth Institute senior research associate Father Paul Sullins, professor emeritus of sociology at The Catholic University of America, summarized the results of this very technical paper as follows: “The study found that a person’s developmental environment — the influence of diet, family, friends, neighborhood, religion, and a host of other life conditions — was twice as influential as genetics on the probability of adopting same-sex behavior or orientation. […] Not only did the study fail to find some controlling gene for gay identity, it also established that gay persons are not genetically distinct from all other human beings in any meaningful sense. Gay persons, we might say, have a perfectly normal human genome.”
Numerous studies of identical twins are inconsistent with the idea that being “gay” is genetically determined. If it were, we would expect 100% “concordance” between identical twins: that is, if one twin is “gay,” the other should be, as well. The actual concordance is closer to 1/3, according to a study that reviewed research conducted about this issue and stated as follows: “Despite the fact that identical twins share 100% of their genes, gay/gay twins are less common than gay/straight twin pairs.”
Numerous studies of identical twins are inconsistent with the idea that being “gay” is genetically determined. If it were, we would expect 100% “concordance” between identical twins: that is, if one twin is “gay,” the other should be, as well. The actual concordance is closer to 1/3, according to a study that reviewed research conducted about this issue and stated as follows: “Despite the fact that identical twins share 100% of their genes, gay/gay twins are less common than gay/straight twin pairs.”
The ‘Born Gay’ Myth: When Ideology Masquerades as Science
COMMENTARY: The available research does not support the claim that same-sex attraction has an immutable genetic origin.
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