What Is A Mutation Page 3
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3Complete the table below with examples of the types of mutations described above. The underlined letter
in the DNA sequence represents the nucleotide that has changed, inserted, or deleted.
Type of Mutation
DNA Sequence
mRNA Sequence
Amino Acid Sequence
Changed or
Unchanged?
Missense
AGG TGC CTC
Mutation
Nonsense
ATC TGC CTC
Mutation
Silent
ATA TGC CTC
Mutation
Insertion
ATT GTG CCT
Mutation
Deletion
TGT GCC TCC
Mutation
2. Let’s imagine that this DNA sequence represents a gene that produces an enzyme required for the
process of photosynthesis in an elm tree. Let’s also imagine that the above mutations occur in a single
cell that makes up a tiny leaf bud on the tree. What is likely to happen to the leaf after each type of
mutation occurs? Will the leaf grow or die? Use complete sentences to explain why.
Missense Mutation:
Nonsense Mutation:
Silent Mutation:
Insertion Mutation:
Deletion Mutation:
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