You got things totally backwards.
Genetically everybody inherits their genes as a mix of their parents genes with a few random mutations and since almost all parents are hetero that means genetically everybody would be hetero, there is no "gay gene".
The part you're totally ignoring is the science fact that the brain develops independent from the body and whether or not the brains wiring matches a hetero orientation is a matter of plain random.
Furthermore there are several switches in the brain all independent from each other, all developping on random, leading to a wild spectrum, of gay, bi, trans and everything else in between.
For roughly 60% of all humans their genetic setup is dominant also for their sexual orientation meaning 60% of all people are genetically straight.
For the other 40% their brains wiring is dominant over their genes, they build a spectrum between 99.9% straight and 100% gay, depending how the switches in their brain developped.
This holds true not just for humans but for many other species as well.
Gay behavior has been observed in monkeys, sheep, goats, dolphins and other species, so reliable with the always same percentages that we can estimate it may exist in all species that have a brain, humans just don't have enough data and not many options to figure it out, about species like spiders or birds.
Many morally questionable attempts to eliminate homosexuality have been made in the past, i.e. by the Nazis, meaning we have enough data from that to be sure, even iffffff you could prevent all homosexuals from having children, make absolutely sure that only 100% straight people reproduce, the very next generation will again have 40% people on the very same spectrum, because their brains still develop independent from their bodies.
Evolution never had an advantage from eliminating homosexuality, because even if homosexuals would never reproduce the 60% straight plus the almost straight part of the other 40% produce far more offspring than required for the survivial of the species and that's why the combination of random mutations plus natural selection cannot eliminate it.
For human evolution in ancient history it's actually the opposite.
The Romans had figured out that nobody fights harder in a battle than a gay man who knows his partner is also in the battle and in danger of getting killed, they had entire legions of exclusively gay men, which led to the fact that gay men in Roman times had an evolutionary advantage over straight men in better chances of survival, but even that didn't change the relation between 60% genetically straight people and 40% on a spectrum.
The only way to eliminate homosexuality would be figuring out how those switches in the brain work in their interaction and develop brain surgery that can alter the brains wiring and if that becomes an option one day the moral question to answer will be: Who gets to decide whether to give priority to the genes or the brain and which part (if any) gets altered?
Forcing children into brain surgery would be highly immoral, especially because you would have to keep doing that for 40% of all people of all future generations.
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