Why did homosexuality continue to be maintained in the process of evolution?
There are a certain number of people who have sexual behavior between the same sex, not only in humans but also in diverse groups of organisms.
Genomic evidence consistent with antagonistic pleiotropy may help explain the evolutionary maintenance of same-sex sexual behavior in humans | Nature Human Behavior
https://www.nature.com/articles/s41562-021-01168-8
Why has same-sex sexual behavior persisted during evolution?
Zietsch and colleagues used genetic data from more than 350,000 people from the research database UK Biobank. We analyzed how genes related to same-sex sexual behavior are associated with answers to the questions 'Have you had a homosexual partner in the past?' And 'How many heterosexual partners have you ever had?'
As a result, it was found that genes related to same-sex sexual behavior are more deeply associated with 'people with many heterosexual partners' in groups that had only heterosexual partners in the past. Zietsch et al. Speculated that 'in the process of evolution, having many partners of the opposite sex may have led to having more children.'
Zietsch and colleagues also conducted digital simulations of reproduction for generations to investigate how same-sex sexual behavior occurs. As a result, it was found that same-sex sexual behavior is maintained in the population even if it is assumed that “same-sex sexual behavior is disadvantageous in evolution”.
From these studies, Zietsch et al. Said, 'There are a certain number of people in the population who have same-sex sexual behavior, and those who have genes related to same-sex sexual behavior and those who have many heterosexual partners. With more genes in common between them, genes related to same-sex sexual behavior may have favored the evolutionary process. '
However, Zietsch said, 'The data we used this time are from modern American and British European individuals, and we don't know how applicable they are to other ethnic groups or cultures.' I know that some people find it inappropriate to study, but if you continue to avoid it, you will remain unable to understand human diversity. ' I left a comment that I have high hopes for my research in.
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