Abortion and the "Gay Gene"

Rob raises the issue of prenatal screening to remedy homosexuality, suggesting that this is not a good path to take.  I want to take this a step further.  If there is a gay gene (see information on gay sheep), isn't it likely that some parents will abort their unborn children if prenatal testing reveals a gay gene.  This happens regularly today with Down's Syndrome children and in India and China it happens regularly when the baby is a girl.  Won't some people, even some quite "progressive" people, rationalize the decision to abort by telling themselves that the world is a much too ugly and intolerant place for their beautiful gay child?  If my intuition is correct, I suspect that it will be the Catholics (and hopefully evangelicals) standing in fairly lonely solidarity with the gay community, advocating the right to life for these unborn children with the "gay" gene.