Why is the genetic code called redundant?

The genetic code is a set of rules that determine how the four-letter DNA code is converted into the 20-letter amino acid code, which are the building blocks of proteins. A genetic code is a set of three-letter combinations of nucleotides called codons, each of which corresponds to a specific amino acid. Although each codon is specific for only one amino acid (or one stop signal), the genetic code is described as degenerate or redundant because one amino acid can be encoded by more than one codon.



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