Final answer:
A silent substitution mutation may not change the amino acid sequence of a protein because of the redundancy in the genetic code, unlike insertion, deletion, or inversion mutations that often lead to functional changes.
Step-by-step explanation:
The mutation that may not result in an amino acid change in the protein product is a substitution mutation, specifically a silent mutation. While insertion, deletion, and inversion mutations often lead to changes in the amino acid sequence, which can result in non-functional proteins due to a process called frameshift, not all substitution mutations cause a change in the amino acid sequence. A silent mutation is a specific type of substitution mutation where the change in DNA sequence does not affect the amino acid produced by a codon due to the redundancy in the genetic code. For instance, if a codon that codes for the same amino acid is substituted, the protein's amino acid sequence will remain unchanged, and thus, the function of the protein may not be affected.