While I don’t think there is any “gay gene”, the field of epigenetics is showing that some genes can become active, or become suppressed to the point of being active or being inactive in some way, due to conditions that are encountered.
Yes, gene’s can be “turned on” or “turned off”, environmentally; so it is not always a given that you either “have a gene or you don’t”, because in some cases a gene is present but dormant - unless some environmental trigger activates it, or some gene that is normally active is dormant, because of a reaction to something.
Epigenetics is showing that the way genes are used, or not, is more than simply having a particular genome; it is dependent in some cases on more than just having certain genes to start with.
What would the abortionists say about a “gay gene” if there was one? They’d be the hypocrites that they are. They’d think it was wrong to abort a baby with a “gay gene” but think it O.K. to abort babies for other genetic reasons.
Even with genes being turned on or off based on environmental factors, I don’t see how there can be a “gay gene” or a set of them. From an evolutionary standpoint, if that gene or those genes resulted in even a 5% lower chance of reproduction (which can simply include having less children), then the gene(s) would become a vanishingly small proportion of the population within a few dozen generations at most. The real question is, how would such a gene or genes arise in the first place? What evolutionary advantage would be conferred by it/them?
I believe that this is a bunch of crap. One again, the libs are stuck with a contradiction in their views, brought about by standing for policies and positions that “feel good” rather than make sense. Most libs are foresquare in the “Darwin was right” column. With that comes the passing of genes THAT CONFER ADVANTAGES TOWARD SURVIVAL UNTIL REPRODUCTION. OTOH, they also contend that being gay is something that people are “born with.” Well, it can’t be both. For that reason, I am quite certain that being gay is an environmental thing, rather than gene-based, since it simply cannot confer any advantage toward successful reproduction.
I am looking forward to the coming lieberal crack-up, pitting ultra-feminists against the gays. Gotta go, must get to the store for some popcorn before it flies off the shelf. :>)