The debate about whether sexual orientation is determined by genes actually appeared as early as the 1990s.
In 1993, American geneticist Dean Hamer did a study on the maternal relatives of certain men of the same sex and compared the X chromosomes of male relatives with homosexual tendencies. Then published a research report, showing that gay men have a “homosexual gene”, and they all have a small identical region on the tip of their X chromosome, and this is probably the key to making them gay. The X chromosome was passed down by the mother, which shocked all walks of life at that time, and has been controversial. Twenty years later, a latest large-scale study not only confirmed Hamer’s statement, but also discovered a second homosexual gene.
Hamer studied the DNA of several gay male brothers and came to a conclusion; the surprising thing is that he presented scientific evidence that homosexuality is not a multiple-choice question of whether a person wants or not, but a natural “sexual” orientation. Homosexuals’ defense of “I was born this way” was rehabilitated, but those who did not believe would never believe it; as late as 2011, there were also social and political criticisms that found homosexual genes. I don’t know how many people will go for fetal genetic screening. Then abortion.
Research: at least two homosexual genes
The Washington Post reported that the latest research confirms that Hammer has been right. There is indeed a homosexual gene, and not only that, there are actually two homosexual genes, or even more (according to probability).
The “Human Genome Project”, an international research team specializing in human DNA, studied the blood of 409 gay brothers and their heterosexual family members, and confirmed that there is indeed a region on the X chromosome that affects a person’s sexual orientation, and that there is a DNA sequence on chromosome 8. Affect men’s sexuality. This undoubtedly brought strong support to Hanmer’s conclusion.
The homosexual gene can be regarded as the gene for loving men
Team member, Northwestern University professor Berry said: “Sexuality has nothing to do with choice. Our research shows that genes may be related. We found that two sets of genes affect whether a man is gay or heterosexual.”
Jeanne Grevis, a well-known professor of genetics at La Trobe University in Australia, said that there may be more than a few genes that affect a person’s choice of spouse sex; she also put forward a different perspective and said that gay genes might be regarded as male-loving genes.
Women may also have genes for loving men
She pointed out that the “love man gene” may have both men and women. If it is in women, these women are usually born to find a spouse earlier, more often to find a spouse, and have more children. Similarly, lace may also have the “female love gene”. “These genes are in men, which also makes these men look for spouses earlier and more often, and have more children.
Greves also said that women with gay men in the family have the “love man gene”, they will find a spouse earlier and give birth to more children. The effect is to compensate for the regret that gay men have fewer children; an Italian research team found that men Homosexual female relatives have 1.3 times as many children as heterosexual male and female relatives. This is an evolutionary balance.
If “same-sex genes” really exist, a new problem will arise
Then, if “same-sex genes” really exist, a new problem has arisen. We all know that the fertility of people carrying “same-sex genes” in their bodies is generally weaker than those of normal sex. Then, why are these “same-sex genes” not eliminated by natural selection and are still active in 15% of people in the world today? The truth is that Is such that.
Researchers said that these “same-sex genes” in men should actually be called “male orientation genes”. These genes not only exist in homosexual men, but also in female relatives with normal sexual orientation. The fertility of females with normal sexual orientation is also in the normal range, and the children and girls continue to live, and the “male orientation genes” in them can be passed on to the offspring. In this way, they make up for the disadvantage of homosexual men’s transmission of “male orientation genes”, so that “male orientation genes” still have a chance to appear in the world. The same theory can of course be applied to lesbians.
“Homosexuality” also exists in the animal kingdom
However, the phenomenon of homosexuality is not only present in humans, but also very common in many kinds of creatures. For example, mice and fruit flies have obvious homosexual tendencies. Therefore, no matter whether homosexuality is a genetic trait, a life choice or an environmental adaptation behavior, we should recognize that this is a normal biological phenomenon, correct misconceptions, and give homosexuals a harmonious interpersonal environment.