Answer;
Point mutation
A point mutation in dna can result in dysfunctional protein production.
Explanation;
A point mutation or substitution is a genetic mutation where a single nucleotide base is changed, inserted or deleted from a sequence of DNA or RNA.
Point mutations have a variety of effects on the downstream protein product; consequences that are moderately predictable based upon the specifics of the mutation. A single point mutation could have no effect, or it could alter the protein that is produced and render it useless.