Is homosexuality genetically determined?

The debate over whether sexual orientation is genetically determined has been around since the 1990s. In 1993 Dean Hamer, an American geneticist, studied the maternal relatives of certain men of the same sex and compared the X chromosomes of their homosexual male relatives. Then a study was published showing that gay men have a "gay gene", a small identical region on the tip of their X chromosome, which may be the key to their homosexuality. The X chromosome is passed down from the mother, then shocked all circles, still controversial; Two decades later, a new large-scale study not only confirmed Hamer's theory, but also identified a second gay gene. Hammer reached his conclusion by studying the DNA of several pairs of gay brothers; The surprising part is to present scientific evidence that homosexuality is not a choice, but an innate "sexual" orientation. The "I was born this way" argument has been vilified by homosexuals, but not by believers; As late as 2011, social and political commentary lampooned the discovery of the gay gene, and wondered how many people would rush for fetal genetic screening and abortion. According to The Washington Post, new research has confirmed that Hamer was right all along, that there is one gay gene, and not only that, but that there are actually two, or (depending on The odds) more. The Human Genome Project, an international team of researchers specialising in human DNA, studied the blood of 409 gay brothers and heterosexual family members and confirmed that there is indeed a region of the X chromosome that affects a person's sexuality, as well as a DNA sequence on chromosome 8 that affects men's sexuality. This certainly lends strong support to Hammer's conclusion. "Sexual orientation has nothing to do with selection," said Northwestern University professor John Berry, a member of the team. "Our study suggests that genetics may be involved. We found two sets of genes that influence whether a man is gay or straight." Jenny?, professor of genetics at La Trobe University, Australia Grevis says there may be more than a few genes that influence a person's choice of mate sex; In a different way, she suggests that "gay genes" might be viewed as "male-loving genes." She points out that the "man-loving gene" may be shared by both sexes, and if it is found in women, these women are born to mate earlier, mate more often and have more children; In the same way, lesbians may also have "female-loving genes", which are found in men and cause them to mate earlier, more often and have more children. Grevis added that women with gay men in their families have a "man-loving gene" that allows them to mate earlier and have more children, compensating for the fact that gay men have fewer children. A team of Italian researchers found that female relatives of gay men had 1.3 times as many children as female relatives of straight men. It's an evolutionary balance. So, if gay genes really do exist, a new problem has arisen. We all know that people who carry "same sex genes" are generally less fertile than those who are sexually normal, so why haven't these "same sex genes" been eliminated by natural selection and are still active in 15% of the world's population today? The truth is this. The researchers say that these "same sex genes" in men should be called "male orientation genes" and that these genes are not only found in gay men, but also in sexually normal female relatives. Women with normal sexual orientation have normal fertility, have more children, and are able to pass on the "male orientation gene" to their offspring. In doing so, they make up for the disadvantage of homosexual men passing on the "male orientation gene", so that the "male orientation gene" still has a chance to appear in the world. And the same theory can certainly be applied to lesbians. Homosexuality, however, is not only found in humans, but also in many species of living things. Mice and fruit flies, for example, are remarkably homosexual. Therefore, whether homosexuality is a genetic trait, a life choice or an adaptation to the environment, we should recognize that it is a normal biological phenomenon, correct the wrong idea, and give homosexuals a harmonious interpersonal environment.