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DNA M

What Is a Mutation? chromosome

A mutation is a change that
occurs in a gene or
chromosome that can cause gene
incorrect or different proteins
to be made and alter an
organism’s normal trait. DNA
strand

mutation

incorrect
protein
made

Types of Mutations

A mutation in the DNA can occur when a single base
pair is changed, removed, or added. Mutations can
also happen when large sections of DNA are altered.
A G A T T

T DNA T C T A A

M
substitution a base pair is changed

A G C T T A G T T
deletion
T C G A A T C A A

a base pair is removed
original DNA sequence addition

A G C C T T

T C G G A A

a base pair is added

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