Regions on two chromosomes seemed to differ the most between people who identified as gay and those who identified as straight, according to a study published in Scientific Reports on Thursday. However, on the whole, the genomes of gay and straight men were not significantly different. However, these results come with a raft of caveats. The sample was limited in several ways:
Monogamy, polygamy, polyandry and all those other social combinations of the basic sexualities are also present throughout the animal world including Humanity of course. But although this may look like enough diversity, there is more, because all of these are variants of bi-gender behaviour alone.
Throughout half of the history of life on Earth, living things reproduced asexually, through simple duplicative division, in a variety of ways. The ancient single-celled animal Tetrahymena thermophilia manages a total of seven different sexes Sexual diversity, like the rest of living complexity 11had to undergo a slow process of evolution, proceeding first through isogamy where there are no genders.
All this should put human wranglings about the sanctity of the nuclear family, or arguments about what sexualities are 'normal' into perspective, because truly everything is natural in nature. We have to work out simply how to live in peace with the realities of sexual diversity in our own species.
The instinctive question that researchers have been concerned with since the time of Darwin 12 is: Because such twins share identical genes, we know that all resultant personality differences are due to non-genetic factors.
The "concordance rate" of a trait between twins tells us to what extent the trait is genetically caused. Studies on identical twins have found, as is always the case, different concordance rates.
The rest is the result of processes in the womb. As a result of these, "Jerome Goldstein, director of the San Francisco Clinical Centre, addressing 3, neurologists at the 21st meeting of the European Neurological Society ENS in Lisbon" in May confirmed that sexual orientation "is primarily neurobiological at birth" Although not common in the UKdiscredited and wrong ideas that homosexuality can be 'cured' have wide support in the USA.
The Royal College of Psychiatrists, a widely respected authority, issued a statement as recently as Feb reiterating "that homosexuality is not a psychiatric disorder.
Furthermore, so-called treatments of homosexuality create a setting in which prejudice and discrimination flourish'' Some brain structures of homosexual men the amygdala and the interstitial nuclei resemble those of homosexual women, and some structures of homosexual women resembled those of heterosexual men.
Other neurological cross-sex similarities have been found. These, combined with twin studies, confirm that the basis of homosexuality is beyond any active social training. Most research has focused almost solely on humanity but the same question could also be answered by studying other social animals who have known rates of homosexuality within their populations.
The preponderance of homosexuality in some family trees, according to LeVayis one reason why we should favour genetic theories of homosexuality. Here are some of them: Homosexual genes are propagated by their non-gay family members.
The reason why families with a tendency to sometimes produce gay offspring are not slowly outperformed in the genetic pool is because the gay members lend effective support to their families as a whole, thus indirectly spreading 'gay' genes However, others are skeptical.
In any event, relevant studies in the United States and United Kingdom have so far failed to provide such evidence.
Oct 08, · Scientists find DNA differences between gay men and their straight twin brothers. By Melissa Healy. Oct 08, | AM. To find the epigenomic markers of male homosexuality, Ngun, a. Homosexuality may be caused by chemical modifications to DNA By Michael Balter Oct. 8, , AM “Baby, I was born this way,” Lady Gaga sang in a hit that quickly became a gay anthem. Summary: The official explanation from the APA says that there is no consensus about what causes homosexuality. But we have observed eight predisposing factors that are common in the backgrounds of men with same-sex attraction.
It is also capable of explaining why homosexuality persists at a constant but low frequency of no more than 8 percent in the general global population" Indeed, one Australian study discovered that gender-atypical traits do tend to enhance reproduction" It is of course true that there may be multiple genetic causes of homosexuality and therefore, all of the theories above have some supporting evidence but each fail to explain the bulk of the prevalence of homosexuality.
Most researchers have abandoned the idea that homosexuality is a purely genetic issue 12 as the evidence points to other influences on the fetus as being important.
Non-Genetic Causes of Homosexuality 18 "It is now fairly well established that prenatal androgen levels have a substantial impact on sexual orientation in both men and women" It is already known that a mother's hormones can affect the formation of a variety of mental traits in their fetus - eating habits, alcohol intake and stress levels are examples where non-genetic environmental factors are known to have an impact, sometimes a defining impact, on the later life of the fetus.
Sexuality can also be affected "For instance, women suffering from congenital adrenal hyperplasia CAH due to elevated levels of prenatal T and other androgens are known to possess gender traits significantly shifted towards masculinity [and] female fetuses more severely affected by CAH [ Non-genetic factors that cause homosexuality have been formulated into a few different theories.
Ray Blanchard, a Toronto sociologist and scientist, investigated a trend he noticed:Oct 08, · For men, new research suggests that clues to sexual orientation may lie not just in the genes, but in the spaces between the DNA, where molecular marks instruct genes when to .
The popular press suggests that homosexuality is the result of genetics. However, the scientific literature shows that for the majority of individuals, sexual orientation is not the result of biology or genetics, but achieved through experiences and behaviors.
• No • The label of “mental disorder” was removed by the American Psychiatric Association in • The American Psychological Association and the World Health Organization agree that homosexuality is not a disorder • Rejection by family and society can be stressful.
Cross-Cultural Evidence for the Genetics of Homosexuality.
Mexico’s third gender sheds light on the biological correlates of sexual orientation. gay mardi gras Homosexuality has become increasingly popular and glamorous within society. Homosexuals and Lesbians are portrayed as happy, exciting, effervescent carefree people. The homosexual and lesbian lobby groups have become increasing powerful and successful in winning gay rights and making legislative changes.
‘Speculative’ genetic link to homosexuality found. Apparent links between genetics and homosexuality are “best described as speculative”.