Amutation that does not change a gene can affect an organism because it can alter:
a. rna b. gametes c. switches d. proteins e. evolution

The mutation that does not change a gene would be referring to the mutation at the transcriptional or translational level during the protein production process and hence it is likely to alter the proteins in terms of the proteins folding to 3D conformation and the proteins function e.g enzymatic active sites

Ais the answer for you