It might make them less numerous compared to hyaenas. It doesn't benefit lion genes in general. But this gene will be selected for.
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Replying to @PoisonAero @RiversofBlood68
That particular gene may be selected for internally among lions even as it reduces lion numbers, sure. We might call this
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different bits of DNA competing against each other within a single organism.
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Replying to @HbdNrx @RiversofBlood68
That's a misleading way to think about it. Remember that "genes competing" is a metaphor.
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Genes compete only in the sense that they are differentially selected, based on what individuals reproduce.
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I have green eyes, which means I have some variants for blue eyes, some for brown. They aren't tearing me apart. They just cause green eyes.
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Those variants have an equal chance of being passed on when I reproduce. They "want" the same thing: for me to reproduce.
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Replying to @PoisonAero @RiversofBlood68
If we take the lion example, what if we have a pride where cub eating has become common next to a pride with no cub eating?
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All else equal, the non-cub eaters will outcompete and may completely displace the cub eaters. (let's assume they don't/can't interbreed).
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So there may be a local competitive advantage to cub eating (or some other trait) but a larger scale competitive disadvantage.
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Whatever ends up winning is going to depend on the nature of the various kinds of competition. I think the process of non-cub eaters winning
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could reasonably be called "group selection"
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