This point mutation alters codon 6 fro ACG (threonine, a hydroxyl amino acid) to TCG (serine, another hydroxyl amino acid). This is a fairly conservative change in the chemistry of the encoded amino acid and so will not have much effect on protein structure and function.
Work Step by Step
To understand, just translate the new protein, especially from the position of the frameshift. Change the T's to U's and then use Table 15.1. Consider the conservative nature of the change in amino acid.