Ilia State University researcher Giorgi Chaladze claims that half of straight men and women carry the homosexuality genes. In the researcher’s study published in the journal Archives of Sexual Behaviour, he explains why homosexuality genes can be passed on without directly inheriting it from homosexual men, enabling homosexuality in men to be prevalent all throughout history and in various cultures.
The researcher found that gay men tend to come from a large family. Apparently, Chaladze believes that the homosexuality genes increased the number of children of their female family members who also have the genes.
This study echoes previous research that stated genetic factors affect sexual orientation and others that claimed straight men are actually carriers of the homosexuality gene. However, earlier studies did not explain how it got passed on from homosexual men when these men have five times fewer children, compared to heterosexual individuals, who can directly get the genes.
The researcher developed an individual-based genetic model to investigate how homosexuality is present in large groups of people. The calculations revealed that male homosexuality’s persistence can only happen if half of the men and a little more than half of the women carry the homosexuality genes.
“The trend of female family members of homosexual men to have more offspring can help explain the persistence of homosexuality,” adds Chaladze. “If we also consider that, those males who have such genes are not always homosexuals.”
Moreover, Chaladze suggests that the study may rationalise why the number of straight men who claim to have an attraction to other men as well as exhibiting same-sex sexual behaviours dwarf the actual number of gay men and bisexual men. It turns out that straight men who carry the genes may sometimes tend to show homosexual behaviours despite identifying themselves as completely straight.
Chaladze adds that this study calls for more extensive genomic studies that will provide more insights into how straight men and women carry the genes that predispose their children to homosexuality. The researcher recommends that future investigators should study participants who do not have any gay relatives.