Genetics Of Homosexuality Essay

1900 words - 8 pages

Genetics of Homosexuality - Are you Born Gay

Genetics of Homosexuality - Are you Born Gay
The question as to whether one is born gay or chooses to become so has been a point of debate for a very long time. The present media sources assume that the query is a solved scientific problem with the indication going towards a biological reasoning possibly genetic for a homosexual alignment (Schumm, 2010). Opposing to this idea, the query has been studied poorly, though there are some indications on all sides of the question. Additionally, several studies which were highly flaunted by the media as evidence for the genetic basis for homosexuality have been ...view middle of the document...

These researches indicated that female and male brains had sexual dimorphism in the pre-optic space of the hypothalamus, where the males showed a greater than two-fold variation in cell size and number as compared to the females. A second research concluded that two of the four Interstitial Nuclei of Anterior Hypothalamus (INAH) were more than two times as large as compared to those in females (Schumm, 2010).
Due to the fact that INAH is related to sexual dimorphism, it was postulated by Simon LeVay that there may be variations in this area in homosexual vs. heterosexual men (Hershberger & Segal, 2004). Postmortem inspection of the brains of AIDS patient versus presumed to be heterosexual males indicated that the seemingly heterosexual men presented INAH3 that were twice bigger than size of both females and homosexual men who had passed on because of AIDS.
The research has been appraised for its indecision of sexual orientation of the subjects, and possible complications caused by the AIDS virus which itself does not affect the human brain, and also by reduced testosterone levels existing in AIDS patients (Diamond, 2006). A disseminated Newsweek cover story of, “Is This Child Gay?” demonstrated LeVay as the champion of the genetic era, even though, the research had no biological data at all.
The function of the hypothalamus in sexual structure was further researched by a scholar called Swaab, et al. Other scientists had hypothesized that variation of the hypothalamus took place before birth (Schumm, 2010). Nevertheless, Swaab’s research indicated that the sexually dimorphic nucleus (SDN) of more than 100 individuals lessened in volume and cell quantity in females of only 2 to 4 years postnatal (Diamond, 2006). These results complicated the discoveries of the brain research since not only hormonal and chemical factors, but also the social factors, may have affected the process.
A research by Gorski and Allen observed the fore commissure of the brain, getting that homosexual males and females had a bigger size as compared to the heterosexual males (Schumm, 2010). Nevertheless, later researches making use of larger sample sizes did not exhibit such variations. Complicating the problem of brain variation between heterosexuals and homosexuals is the issue that sexual involvements themselves can impact on the brain structure (Diamond, 2004). So, the query will always be whether homosexual exercise affects the brain or whether the brain causes homosexual practice.
Hormonal Influences
Sexual orientation occurs inside the womb. And this is always as a result of hormonal influences. It has since been postulated that homosexuality might occur due to the hormonal variation balance inside the wombs of those women who exhibit homosexual orientation (Diamond, 2004). Since the hormonal levels in the womb are always not present, proxies for the hormonal influences have been utilized to scrutinize the query of how hormonal effects might affect...

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