Table 2.
Illustrates how the codons for 10 amino acids came to be as predicted by the GNC-SNS primitive genetic code hypothesis, where N and S represent either of four bases (A, U, G, and C) and G or C, respectively. The hypothesis contends that the universal genetic code originated from the GNC primordial code (four codons and four amino acids) through to the SNS primitive code (16 codons and 10 amino acids), culminating into his GADV hypothesis [12].
| U | C | A | G | ||
|---|---|---|---|---|---|
| C | Leu (CUC) | Pro (CCC) | His (CAC) | Arg (CGC) | C |
| Leu (CUG) | Pro (CCG) | Gln (CAG) | Arg (CGG) | G | |
| G | Val (GUC) | Ala (GCC) | Asp (GAC) | Gly (GGC) | C |
| Val (GUG) | Ala (GCG) | Glu (GAG) | Gly (GGG) | G |