Question

which is a point mutation and not a frameshift mutation?
mutagen
insertion
deletion
silent

Explanation:

A point - mutation is a change in a single nucleotide. A silent mutation is a type of point - mutation where the change in the nucleotide sequence does not result in a change in the amino - acid sequence of the protein. Insertion and deletion can cause frameshift mutations if they are not in multiples of three nucleotides. A mutagen is an agent that causes mutations, not a type of mutation.

Answer:

D. silent