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What is a gene mutation and how do mutations occur?
A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people.
Mutations range in size; they can affect anywhere from a single DNA building block (base pair) to a large segment of a chromosome that includes multiple genes.
Gene mutations can be classified in two major ways:
* Hereditary mutations are inherited from a parent and are present throughout a person's life in virtually every cell in the body.
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