The Molecular Basis Of Inheritance

• A codon denotes a series of nucleotides found on messenger RNA (mRNA), serving to represent a particular amino acid or signaling the initiation or termination of a process.
• Comprising a triplet combination of the nitrogenous bases adenine (A), guanine (G), cytosine (C), or uracil (U), codons include sequences such as GUU, GCC, UCA, and CUA.
• Among the 64 codons present, 61 encode the 20 amino acids essential for protein synthesis, while the remaining three function as stop signals.

So, the correct option is (A): 64