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Does a gene mutation that could define a whole species happens on a single individual from which we all descend? Or is it possible that the same mutation happened independently on separate times and spaces?

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Does a gene mutation that could define a whole species happens on a single individual from which we all descend? Or is it possible that the same mutation happened independently on separate times and spaces?	1
Does a gene mutation that eventually becomes dominant really starts with a SINGLE individual getting it?	1