A " non-degenerate code " is one for which different elements of the set of correctable errors produce linearly independent results when applied to elements of the code.
2.
When an amino acid may be encoded by more than one codon ( so-called " degenerate coding " ) a mutation in a codon may not produce any change in translation; this would be a silent mutation ( a type of synonymous substitution, which is not always silent ) and not a missense mutation.
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