Genes are just one part of the story. Then there’s epigenetics. Gene expression based on external triggers, and so on.
Genes are just one part of the story. Then there’s epigenetics. Gene expression based on external triggers, and so on.
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Yes, epigenetics are an evolving field. I have an interest in the expression or non-expression of certain genes, since I have an anxiety disorder, and current thinking is that anxiety disorders are probably genetic but must be triggered by events. I also happen to have a pair of twins (fraternal) and belong to a twin moms club, so I get to see several different sets of identical twins socially on a regular basis. The identicals are NOT identical. One will be taller. One is more outgoing. (Their personalities can be markedly different.) Even their eye color can be more different than you would think, and yet they have been tested and confirmed as identical twins.
I also knew a number of gay young men when I was in college. Some were real flamers that had never been with a woman or probably would even be able to do so. Others were more “bi.” Given the fact that some homosexuals are indeed able to perform with women — not enthusiastically, mind you, but they can do it — and also if the gene must be “triggered” to be expressed (like an anxiety disorder), it would be no big surprise that homosexuality would persist in the population despite the fact that a number of “expressed” homosexuals would never breed.