In the interest of balance, I’m going to provide a small sample of studies that have shown a clear genetic link for homosexuality (there are many more available). If Zeb is sincere in his statement about a genetic cause for homosexuality, maybe he will read these with an open mind.
My current opinion is that both genetics and environment come into play in the expression of homosexual orientation, just as they affect the expression of heterosexual orientation.
Regardless, I will say yet again that the causes of homosexuality are irrelevant. What matters is whether or not sexual orientation can generally be changed. Every major medical and mental health organization has conclusively determined that it cannot generally be changed, and in fact attempting to do so can be damaging to the person trying to change.
Gay genes - possible genetic basis for homosexuality - Sex - 1992
Studies of identical twins vs fraternal twins and adoptive siblings seemed to indicate a genetic basis for homosexuality. These results suggest the evolutionary …
Discover, 1/1/93
X marks the spot - possible genetic link to homosexuality found on the X chromosome - 1993 - The Year in Science
Molecular biologist Dean Hamer found a region of the X chromosome that gay men in the same family shared, suggesting a genetic factor of homosexuality passed by the mother. Though more research is nee
Discover, 1/1/94
Sexuality At Hand - research links homosexuality to left-handedness - Brief Article
Is sexual orientation in the genes? Yet another indication might be at hand. According to Kenneth Zucker, Ph.D., a researcher at the University of …
Psychology Today, 11/1/00
Genetic clue to male homosexuality emerges
National Cancer Institute geneticists have located a portion of the X chromosome that they believe contains a gene that predisposes some individuals to …
Science News, 7/17/93
Portrait of a gene guy - genetic researcher Dean Hamer
National Institutes of Health researcher Dean Hamer has been studying the link between genetics and human behavior for several years. He conducted studies …
Discover, 10/1/97
X chromosome again linked to homosexuality
The results of genetic analyses on homosexual brothers provide evidence supporting that a gene or genes in the X chromosome plays a role in male homosexuality.
Science News, 11/4/95
Gays given wrong spin on genetics - scientific discovery of genetic predisposition to homosexuality - Column
Scientific research is uncovering data that shows biological imprint in gay behavior. This sets the tone for preventing laws against homosexuals because …
Insight on the News, 8/30/93
What is normal? - heredity and homosexuality
Researchers Michael Bailey and Richard Pillard have come up with evidence that supports the hereditary component in homosexuality. Their assumption that …
National Review, 2/3/92
Sex and the brain - neurobiologist Simon LeVay found a link between brain structure and homosexuality
LeVay’s discovery of a difference in a part of the hypothalamus between gay and heterosexual men has spurred research on genetic causes of homosexuality …
Discover, 3/1/94
Genetic clues to female homosexuality - research from female twins and adoptive sisters
Research suggests that genes may influence the development of lesbianism among women. Twin and adoptive sisters were studied in the project. Some studies …
Science News, 8/22/92
Birth Order and Sexual Orientation in a National Probability Sample
The relations between birth order and sexual orientation in both men and women were examined in a national probability sample of the United States (Laumann, …
Journal of Sex Research, 11/1/00