On July 15, 1993, National Public Radio (NPR) made a dramatic announcement on stations across the country: Was a team of scientists at the National Institutes of Health on the trail of a gene that causes homosexuality? Their report would be published the next day in Science, one of the two most prestigious scientific research journals in the world.[1]
The discussion that followed explained for the listening public the implications of these findings for social attitudes toward homosexuality and for public policy concerning it. Science was on the verge of proving what many had long argued: that homosexuality is innate, genetic and therefore unchangeable-a normal and commonplace variant of human nature. In the light of these findings, surely only the bigoted or ignorant could condemn it in any way.
Shortly after the announcement, amidst a well-orchestrated blizzard of press discussions, there ensued the watershed legal battle over "Proposition 2" in Colorado. (This popularly enacted legislation precluded making sexual orientation the basis of "privileged class" minority status, a status conferred previously only on the basis of immutable factors such as race.)
Among the many crucial issues raised by the legislation was the question as to whether homosexuality was indeed normal, innate and unchangeable. One prominent researcher testified to the court, "I am 99.5% certain that homosexuality is genetic." But this personal opinion was widely misunderstood as "homosexuality is 99.5% genetic," implying that research had demonstrated this. Certainly, that was the message promulgated by NPR's report on the recent research, and by all the discussions that followed. In a few weeks, Newsweek would emblazon across its cover the phrase that would stick in the public mind as the final truth about homosexuality: "Gay Gene?"
Of course, just near the end of the NPR discussion, certain necessary caveats were fleetingly added. But only an expert knew what they meant- that the research actually showed nothing whatever in the way of what was being discussed. The vast majority of listeners would think that homosexuality had been all but conclusively proven to be "genetic." But the real question is whether or not there is such a "gay gene."
In fact, there is not, and the research being promoted as proving that there is provides no supporting evidence. How can this be? In order to understand what is really going on, one needs to understand some little- known features of the emerging study of behavioral genetics (much subtler than the genetics of simple, "Mendelian" traits such as eye color).
When it comes to questions of the genetics of any behavior-homosexuality included-all of the following statements are likely to be at least roughly true:
Such and such a behavior "is genetic";
There are no genes that produce the behavior;
The genes associated with the behavior are found on such and such a chromosome;
The behavior is significantly heritable;
The behavior is not inherited.
The scientific distinctions that make these seeming contradictions perfectly reasonable and consistent seem completely misunderstood by the media who report on them.
