Fill in the Blanks DNA MutationsOnline version Learn important DNA mutations! by Raquel Elizondo 1 A is a mutation that exchanges one base for another ( a change in a single " chemical letter " ) . are mutations in which extra base pairs are inserted into a new place in the DNA . are mutations in which a section of DNA is lost . Because protein - coding DNA is divided into codons three bases long , insertions and deletions can alter the gene so that the message is not correctly parsed . These changes are called . A mutation occurs when you change a codon to one that encodes the same amino acid and causes no change in the protein produced .
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