DNA evolution simulation

Here's the latest in DNA evolution simulation:


One of the things that frustrated me with these DNA simulations is
that they always have an original to compare off of. And they pick
which mutations are kept by how well they comply with that standard.
Doesn't that sound a little unrealistic? Or maybe I missed Nature's
ability to pick things based on their goodness? But wait, doesn't that
make Nature and the "goodness" standard similar to God?

Or did I really miss something?

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