Not if it is recessive. Example with a recessive "gay gene": Both parent have one normal allele and one "gay" allele. The repartition of the offspring will be:

- 25% both normal alleles (normal phenotype) - 50% one normal allele (normal phenotype) - 25% both gay alleles (gay phenotype)

But homosexuality is not a gene. I believe that the [fetal androgen exposure theory](https://en.wikipedia.org/wiki/Prenatal_hormones_and_sexual_o...) is the one currently preferred.