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Hopefully this syllogism will answer your question. Given the following premises: In the absence of selection, fitness of individuals are at a theoretical maximum. If a theoretical maximum fitness is achieved then effective population size is maximum. If there is an allele that confers both increased and decreased fitness you have a genetic conflict (e.g. ...


It seems we have more hypothesis than theories. There is a book called "The Moral Animal", by Robert Wright, where he cites some researches relating order of birth with sexual orientation (of course, not a 100% direct relationship). That's for the proximal cause. For the distal cause (evolutive) it makes sense to me that we are a sort of "eusocial" species, ...

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