BigBrudder wrote:
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Well, you're forgetting the adoption and surrogacy options, and the fact that there are many gay people who have children from previous heterosexual relationships.
And adopted children have nothing to do with their adoptive parents genetically, you can only get genes from biological parents not adoptive parents, so that part of your objection is meaningless. Surrogacy and artificial insemination is quite new; neither have been around long enough to keep a "gay gene" propagated in the gene pool.
My first point, about adoption and surrogacy, was separate from my second point, which concerned the transfer of genes through natural reproduction. Just pointing out that adoption and surrogacy are ways by which gay couples can become parents.
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As I stated before, a genetic predisposition to homosexuality can only be propagated to offspring by bisexuals, and given that most children with bisexual parent(s) are still heterosexual, even that proposition is pretty doubtful. If homosexuality was genetic, it would be on the decline ever since it was introduced into the gene pool, because heterosexual people are more likely to successfully reproduce than homosexuals, and the reproductive probability differential between the two groups could be used to predict the number of generations required for the "gay gene" to die out completely.
I'll state first off that I'm not convinced of the gay gene theory either. And from what I hear, neither is the scientific community. But devil's advocate.....
You're still not addressing the fact that any gay gene could be transfered by gay parents who married members of the opposite sex and had children with them. Keep in mind, there would have been a lot of pressure on gay people in past times to conform to social norms. Ours is the first generation where gay people don't have to hide their orientation, and so fewer are denying their orientation and marrying people of the opposite sex. So the gay gene will still be alive today, in people born of secretly gay parents in less accepting times.
But that's just if the gene is transfered directly. As I said before, there's the possiblity that the gay gene could be a
recessive carrier gene. One example of a carrier gene is the haemophilia gene. If haemophilia were transferred directly, it would be likely that it would die out in the same way that you described the gay gene dying out - because, certainly in past times, a high child mortality rate was attached to it.
But haemophilia is actually transfered by the haemophiliac's parents through the carrier gene - the parents may not be affected themselves, but they have the gene in a dormant state, to affect the child. The child's siblings too may get the gene to pass to their descendents, yet not be affected directly by the gene.