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Re: Is close enough good enough?
The genetic replication mechanism are pretty effecient. Even if there are transcription errors they are often repaired. The main driving force seems to be not particularly mutation, but selective breeding of succesful individuals within the phenotypic spectrum. For example, if a population of animals finds that a larger trait A (arm length, lung capacity, whatever) is advantageous, those in the normal population with the larger trait will be more successful and produce more offspring. The median measure for trait A will then over a few generations be larger than it started. His is notr from mutaion but natural selection pressure opting for a better fit individual withing the normal phenotype. You will have shift but not mutation. This is how much adaptation occurs.
This is not to say that mutation is not a vital role in species evolution, but genetic drift is a more common one.
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Don't walk behind me; I may not lead. Don't walk in front of me; I may not follow. Just walk beside me and be my friend.
Albert Camus
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