Final answer:
The genetic code is redundant, allowing multiple codons to code for the same amino acid, which helps prevent errors in protein synthesis.
Step-by-step explanation:
The genetic code is redundant, which means that each amino acid can be encoded by more than one codon. For example, the amino acid threonine can be coded by four different codons: ACU, ACC, ACA, and ACG. This redundancy is advantageous because it helps prevent errors in protein synthesis. If a base in the codon changes by accident, there is still a good chance that it will code for the same amino acid.