Yes, there would be limited numbers of queers if it was solely genetic, but not anywhere near the numbers we see now. Most recessive traits, such as in eye color, hair color, height, etc. continue to exist widely because they don't affect life or reproduction. Being queer, if it were actually caused by a recessive gene, would be slower to propagate than blue eyes, for example, because the queers with the double recessive gene wouldn't be passing on their genes. On the other hand, someone with blue eyes is just as likely to have kids as someone with brown eyes.

Being queer is not genetic. It's a lifestyle choice.