Question

what is one way that a frameshift mutation could occur? (1 point) two nucleotides are substituted two nucleotides are deleted three nucleotides are deleted three nucleotides are inserted

Explanation:

A frameshift mutation is caused by insertions or deletions of nucleotides that are not multiples of three, as the genetic code is read in codons (groups of three nucleotides). Substitution doesn't shift the frame. Deleting three or inserting three nucleotides (multiples of three) would add/remove whole codons, not shift the frame. Deleting two nucleotides (not a multiple of three) will shift the reading frame. So "two nucleotides are deleted" is a cause of frameshift mutation.

Answer:

B. two nucleotides are deleted