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a gene that favors same gender sex? Such genes will die out very fast
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Statistically speaking, an individual has the same chances of sharing a particular gene with a sibling* (I'm using gene in the sense of "bit of DNA that is the fundamental unit of heredity") as they are of their own offspring, both at 50%. It might benefit an individual, therefore, to develop a non-reproductive strategy, in order to care for siblings.
Granted, I'm not including homo sapiens in this, as consciousness throws a bit of a spanner into pure genetic determination. Then we get to talking about memes in association with genes and it gets even more complicated. I've truly making these statements in very broad terms. Reading more about the subject of will help you see why the "common sense" approach isn't always the correct one. Richard Dawkins is a good place to start, "The Selfish Gene" in particular.
*A sibling from a monogamous parental mating.