What types of effect(s) are frameshift mutations likely to have?

A frameshift mutation will in general cause the reading of the codons after the mutation to code for different amino acids.

Explanation:

Frameshift mutations are among the most harmful changes to the coding sequence of a protein. They are extremely likely to lead to large-scale changes of chemical composition, resulting in a non-functional protein that often disrupts the biochemical processes of a cell.

your spelling is a little off : ]