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Mutations in DNA
Point mutations
9
Biology
9th Grade
04/08/2012

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Term
Mutation
Definition
A change in the DNA
Term
Point mutation
Definition
A change in one or a few bases in the DNA
Term
Substitution
Definition
One base is replaced for another
Term
Silent mutation
Definition
A change in the third base of a codon, so that the same amino acid is still inserted into the protein.
Term
Missense mutation
Definition
Another name for a silent mutation
Term
Nonsense mutation
Definition
A mutation that forms a new stop codon so that we make a shorter protein that cannot function correctly
Term
Frameshift mutation
Definition
A mutation that changes the reading frame of the ribosome.
Term
What causes a frameshift mutation?
Definition
A base is added or deleted.
Term
Why are frameshift mutations so serious?
Definition
Because every amino acid after the mutation is wrong, so we make a useless protein.
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