Re: What prevents evolution?
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What is the differnece between micro and macro evolution? If micro evolution produces changes within populations what prevents macro evolution?
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It's partly a matter of scale. Larger changes become exponentially (that one's for you, borodog) more difficult to achieve that miniscule changes, especially when multiple concurrent changes in structure or function are required.
Also, in your example, all that changed was the frequency of already existing alleles. You'll need a more insightful example than that to convince anyone.
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