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The Differences Between Group Selection and Individual Level Selection
Group selection isn't mutually exclusive with or some sort of alternative framework to gene level selection or individual level selection. Group group selection is a series of nested comparisons. And it's at that level that selfishness beats altruism. Then you compare the fitness differences between groups in a multi group population. That's where altruism beats selfishness. But when it does, that gene is more fit than the genes that didn't evolve. So here's where we get into these like different frames of comparison.