Final answer:
Frameshift mutations are caused by the insertion or deletion of nucleotides, changing the reading frame. An example of a frameshift mutation is the deletion of one nucleotide.
Explanation:
Frameshift mutations result from the insertion or deletion of one or more nucleotides, causing a shift in the reading frame of the base sequence. An example of a frameshift mutation is the deletion of one nucleotide, which alters the entire sequence downstream.
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