A permanent adapt, a structural alteration, in the DNA or RNA. In humans and plentiful other organisms, mutations occur contained by DNA. However, in retroviruses close to HIV, mutations occur within RNA which is the genetic material of retroviruses.
Mutations can be cause by many factor including environmental insults such as radiation and mutagenic chemicals. Mutations are sometimes attributed to random occasion events.
life style, environments, diets, gene itself, physical+chemical damages etc
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