I'm not really sure what is gained by revealing this type of information. A biological basis for homosexuality simply means that homosexuality is some sort of genetic mutation that is undesirable in the grand scheme of life. Since homosexuals don't bear offspring, they don't pass their genetic material to another generation.
It's not such a big deal in the human world where we set goals other than having children and raising them, but a homosexual animal is very undesirable in nature. An animal's most important goal in life is to produce offspring. It's safe to say that any homosexual animal species died out long ago.
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Trinity: "What do you need?"
Neo: "Guns. Lots of guns."
-The Matrix
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