Answer:
Code for the same amino acid as the original codon
Step-by-step explanation:
Mutation, which is any alteration in the nucleotide sequence of a gene, can occur when there is a replacement of base nucleotides. This is called SUBSTITUTION MUTATION. Substitution mutation can either lead to missense, nonsense or silent mutations.
As stated in this question, SILENT mutation is the one in which there is no change in the amino acid sequence after translation of the mutated mRNA. In other words, the mutation leads to an alteration of codon but the MUTATED CODONS CODE FOR THE SAME AMINO ACID as the original codon, hence, no effect on the protein produced or individual, in general.