Genetic code be qualified as a "degenerate code", Biology

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Q. Why can the genetic code be qualified as a "degenerate code"?

The genetic code is a degenerate code because there are amino acids codified by more than one type of codon, it is not a system in which each element is codified by only one codifying unit.

For example, the amino acid arginine is codified by six codons CGA, CGC, CGU, CGG, AGA and AGG.

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