Genetic code refers to the sets of three nucleotides each of which codes for a specific amino acid. Genetic code is universal which means that each triplet codon code for the same amino acid in all the organisms.
For example, the triplet codon "CUU" codes for amino acid "leucine" in all the organisms of all the groups. Each triplet codon codes for the same specific amino acid in humans, mice, birds, etc.
