taken from http://www.narth.com/docs/istheregene.html
Researcher Simon LeVay
"At this point, the most widely held opinion [on causation of homosexuality] is that multiple factors play a role."{7}
{7} LeVay, Simon (1996). Queer Science, MIT Press.
...in the well-known LeVay brain study which measured parts of the hypothalamus, your colleagues perform a series of autopsies on the brains of some dead people who, they have reason to believe, were basketball players.
Next, they do the same with a group of dead nonbasketball players. Your colleagues report that, on average, "Certain parts of the brain long thought to be involved with basketball playing are much larger in the group of basketball players."
A few national newspapers pick up on the story and editorialize, "Clearly, basketball playing is not a choice. Not only does basketball playing run in families, but even these people's brains are different."
You, of course, as a scientist, are well aware that the brain changes with use...indeed quite dramatically. Those parts responsible for an activity get larger over time, and there are specific parts of the brain that are more utilized in basketball playing.
Now, as a scientist, you will not lie about this fact, if asked (since you will not be), but neither will you go out of your way to offer the truth. The truth, after all, would put an end to the worldwide media blitz accompanying the announcement of your findings.
taken from http://www.narth.com/docs/istheregene.html
From Dennis McFadden, University of Texas neuroscientist:
"Any human behavior is going to be the result of complex intermingling of genetics and environment. It would be astonishing if it were not true for homosexuality."{8}
{8} "Scientists Challenge Notion that Homosexuality's a Matter of Choice," The Charlotte Observer, August 9, 1998.
taken from http://www.narth.com/docs/istheregene.html
But before we consider the specifics, here is what serious scientists think about recent genetics-of-behavior research. From Science, 1994:
Time and time again, scientists have claimed that particular genes or chromosomal regions are associated with behavioral traits, only to withdraw their findings when they were not replicated. "Unfortunately," says Yale's [Dr. Joel] Gelernter, "it's hard to come up with many" findings linking specific genes to complex human behaviors that have been replicated. "...All were announced with great fanfare; all were greeted unskeptically in the popular press; all are now in disrepute."{1}
{1} Mann, C. Genes and behavior. Science 264:1687 (1994).
taken from http://www.narth.com/docs/istheregene.html
Homosexual Twin Studies
Two American activists recently published studies showing that if one of a pair of identical twins is homosexual, the other member of the pair will be, too, in just under 50% of the cases. On this basis, they claim that "homosexuality is genetic."
But two other genetic researchers--one heads one of the largest genetics departments in the country, the other is at Harvard--comment:
While the authors interpreted their findings as evidence for a genetic basis for homosexuality, we think that the data in fact provide strong evidence for the influence of the environment.{2}
The author of the lead article on genes and behavior in a special issue of Science speaks of the renewed scientific recognition of the importance of environment. He notes the growing understanding that:
... the interaction of genes and environment is much more complicated than the simple "violence genes" and intelligence genes" touted in the popular press.The same data that show the effects of genes, also point to the enormous influence of nongenetic factors.{3}
{2} Billings, P. and Beckwith, J. Technology Review, July, 1993. p. 60.
{3} Mann, C. op. cit. pp. 1686-1689.
taken from http://www.narth.com/docs/istheregene.html
"Gay gene" researcher Dean Hamer was asked by Scientific American if homosexuality was rooted solely in biology. He replied:
"Absolutely not. From twin studies, we already know that half or more of the variability in sexual orientation is not inherited. Our studies try to pinpoint the genetic factors...not negate the psychosocial factors."{4}
Dean Hamer and his colleagues had performed a common type of behavioral genetics investigation called the "linkage study." Researchers identify a behavioral trait that runs in a family, and then:
a) look for a chromosomal variant in the genetic material of that family, and
b) determine whether that variant is more frequent in family members who share the particular trait.
To the layman, the "correlation" of a genetic structure with a behavioral trait means that trait "is genetic"-in other words, inherited.
In fact, it means absolutely nothing of the sort, and it should be emphasized that there is virtually no human trait without innumerable such correlations.
taken from http://www.narth.com/docs/istheregene.html
There are only two major principles that need to be carefully understood in order to see through the distortions of the recent research. They are as follows:
1. Heritable does not mean inherited.
2. Genetics research which is truly meaningful will identify, and then focus on, only traits that are directly inherited.
Almost every human characteristic is in significant measure heritable. But few human behavioral traits are directly inherited, in the manner of height, for example, or eye color. Inherited means "directly determined by genes," with little or no way of preventing or modifying the trait through a change in the environment.