A substitution mutation occurs in a gene coding for an enzyme.
Which of the following choices is the MOST unlikely result?
The mutation produces a codon that codes for the same amino acid as the original. The enzyme protein's structure is unchanged.
The mutation produces a codon that codes for an amino acid with similar chemical properties to the original (e.g., polar, nonpolar, etc.), resulting in an enzyme with the same function as the original.
The mutation produces a stop codon in place of a codon for the placement of an amino acid. This produces a protein that is shorter than the original and a nonfunctional enzyme.
The mutation produces a codon that codes for an amino acid with different chemical properties than the original. The enzyme now catalyzes a different reaction than the original.