A mutation that involves one or a few nucleotides is called a point mutation.

Here's why:

* Point mutations are the simplest type of mutation, affecting only a single nucleotide in a DNA sequence.

* They can be further categorized as:

* Substitutions: One nucleotide is replaced by another.

* Insertions: One or a few nucleotides are added to the sequence.

* Deletions: One or a few nucleotides are removed from the sequence.

Let me know if you'd like more information about point mutations or other types of mutations!