In this activity, you will examine three different mutations. drag the white labels to the white targets to indicate what each mutant mrna codon codes for. (you will probably need to consult the codon table for mrna .) drag the pink labels to the pink targets to indicate the type of mutation. drag the blue labels to the blue targets to indicate the effect on the polypeptide's primary structure. labels may be used once, more than once, or not at all.