Codons form a unit of the genetic code that determines a specific Codons are successive sequences of three nucleotides, found in DNA or RNA (when the transcription occurs), codons in RNA will be translated to a polypeptide sequence (a sequence of amino acids),
The amino acids present in the polypeptide sequence strongly depend on the RNA codons. because each codon will code for a specific amino acid, for example, the AUG (adenine -uracyl-guanine sequence) will code for a methionine, if one of the nucleotides in the RNA change, it may change the resulting amino acid which, could change the protein structure and activity.
It should be noted that one amino acid can be translated from different codons, for example, AUA, AUC and AUU code for the same amino acid which is Isoleucine A codon can also be translated as a stop signal to terminate the translation.
