Well, first of all, it's not that simple. The second gene, still functions, unless it's somehow witched off. This idea relies on a chance copying event , then the gene somehow being switched off, randomly mutating to something approximately a new function, then being switched on again so natural selection can go on. Nothing really new here, just a lot of ifs, and the problem of a mutation actually producing new information is still there, just like before. Going further, mutations don't only occur on the mutated gene (that's what you'd want (fr)); they occur throughout the genome affecting the functioning gene. Selective mutations in the target gene are extremely rare. The larger the genome the lower the mutation rate a creature can sustain without error catastrophe; it takes even longer for any mutation to occur, let alone a desirable one, in the duplicated gene. So, if mutation did produce information (which you still haven't shown me) you just wouldn't have enough time...
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