Codon degeneracy
![Grouping of codons by amino acid residue molar volume and hydropathy.](/Images/godic/202501/05/ELLIPTICAL_GENETIC_CODE_Ian0121.png")
Degeneracy of codons is the redundancy of the genetic code, exhibited as the multiplicity of three-codon combinations specifying an amino acid. The degeneracy of the genetic code is what accounts for the existence of synonymous mutations.