Genetic Code Statistical Attributes

There is a significant amount of redundancy in the genetic code because most amino acids are encoded by multiple codons. Therefore, it is interesting to know the degeneracy 0-fold degenerate sites are those at which all changes are nonsynonymous. 2-fold degenerate sites are those at which one out of three changes is synonymous. (All sites at which two out of three changes are synonymous also are included in this category.) 4-fold degenerate sites are those at which all changes are synonymous. of each codon A codon is triplet of nucleotides that codes for a specific amino acid. position in all codons. In MEGA this information can be computed for an code table in the Genetic Code Selector. In addition to the degeneracy 0-fold degenerate sites are those at which all changes are nonsynonymous. 2-fold degenerate sites are those at which one out of three changes is synonymous. (All sites at which two out of three changes are synonymous also are included in this category.) 4-fold degenerate sites are those at which all changes are synonymous. of codon A codon is triplet of nucleotides that codes for a specific amino acid. positions, MEGA writes the number of synonymous sites and the number of non-synonymous sites for each codon A codon is triplet of nucleotides that codes for a specific amino acid. using the Nei and Gojobori(1986) method. An example of the results obtained for the standard genetic code is given below.