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adt wrote
it's also fairly clear that small genetic changes can create large changes in form in one step, as with the 4 legged duck
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Interestingly, PZ Myers posted a pic of a 4-legged duck this week. He writes, "This is almost certainly not the result of a mutation, and it's one of my pet peeves when the media makes this wrong assumption, that every change in a newborn is the product of a genetic change. This is the result of a developmental error, not a genetic one, most likely caused by a fusion of two embryos in a single egg."