Question

which is a frameshift mutation?
substitution
nonsense
silent
deletion

Explanation:

A frameshift mutation occurs when nucleotides are inserted or deleted, shifting the reading - frame of the genetic code. Substitution is a point mutation where one base is replaced by another. Nonsense mutations introduce a premature stop codon. Silent mutations do not change the amino - acid sequence. Deletion can cause a frameshift if the number of nucleotides deleted is not a multiple of 3.

Answer:

D. deletion