One U.S. study: “Homosexuality is decided by 30 or 40 percent by the genes”
The homosexuality at least in part is transmitted by the genes, just like the color of the eyes or the hair. To support an American study, led by psychologist Michael Bailey of Northwestern University and presented a few days ago at the meeting the annual American Association for the Advancement of Science. Should this be confirmed, it might change the perception of gays and the belief that their sexual orientation is merely the result of a personal choice and not something intrinsic to their being.
Bailey came to the conclusion that genetics is to decide on the homosexuality of a person conducting a survey of 400 homosexual. Through some tests it was discovered that a gene in the region Xq28 and another which is located in chromosome 8 to play a key role in the development of this sexual orientation. These two genes that are passed from mothers to children, and that would have survived evolution because they make women more fertile.
On this basis, homosexuality has nothing to do with a personal choice, but would be decisive of hereditary characteristics. “The study, however, says Bailey is not completely definite, because other factors have an impact.” According to the scholar, in fact, genetics decide the sexual orientation of a person only for the 30 or 40 percent . Then play an important role also specific environmental factors or the level of exposure to hormones during pregnancy.
For years trying to resolve this conflict between nature and the environment in which it grows, when it comes to this issue. In 1993, Dean Hamer of the U.S. National Cancer Institute had examined the family histories of 100 homosexual and had come to the conclusion that their sexual orientation was written on chromosome X. Then in a subsequent investigation it was noted that 33 of the 40 gay analyzed had inherited markers similar genetic Xq28 region of the X chromosome in the controversy that followed did abandon those studies. Today, Bailey is back on the issue and seems to have confirmed what we already had in the past intuition.