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Instead of some parents having lots of kids, if the number of kids were spread more evenly to parents having few kids and people who have no children, would it introduce more genetic variability in our species in general?

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Well the obvious answer is of course yes of course it would. That is the essence of natural selection. Variability leads to different phenotypes and selection for and the amplification of beneficial traits. Evolution. Except if there is no selection (everyone has the same amount of kids) no traits are amplified so everything in a large population is static. Until you introduce mutations and that increases variability. Eventually each individual would have such a large degree of variation from the next that I would assume speciation would be a very imminent result of any form of seperation or selection, which is against your original premise.

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  • $\begingroup$ This is a good answer, and the only thing I would add is that the question does not mention whether all children have an equal chance to grow up and reproduce. Given that accidents and illnesses might not be entirely random and might have genetic dependencies, natural selection would still be free to operate in a society where fecundity was evenly spread. $\endgroup$ – Jonathan Moore Aug 28 at 15:29

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