the genetic code is triplet, meaning a sequence of three nucleotides in mRNA forms a codon for a specific amino acid . This was famously proposed by the physicist George Gamow, who reasoned that since there are only four nitrogenous bases and they must code for 20 amino acids, a combination of three bases (4³) providing 64 codons was necessary to cover all requirements . This is a fundamental concept in molecular biology, and mastering it is essential as NCERT textbooks serve as the definitive source for approximately 95% of NEET Biology questions .