Although I can imagine viable explanations for the second question, I cannot imagine how genes can be passed between generations when there are no generations.My guess is that they will say we all have this gay gene but people supress the gayness and now they are accepting this "feeling" and running with it.
So in about 2 generations, Darwins theory will take hold.
Of course I believe none of this junk. Environment and mortal sin is the cause in my Book.
Your answer to question two is the same as mine would have been but, as I said, I can imagine explanations for the ever-increasing expression of homosexuality. As to your "book" of real causes, I agree totally with that same book. My real desire was to point out the fallacy in the argument that a genetic factor obviously detrimental to the continued survival of any species can be inherited across non-existent generations. What can be inherited are the environmental factors that adversely affect embryonic development, as well as childhood development. Again, our "book" is very clear though. One may be born with the proclivity toward kleptomania, but one does not have to act on it.
Muleteam1