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Chrissy Teigen Gets Fully Naked In Hot Photoshoot with John Legend

In general, mutation is the main source of genetic variationwhich is the raw material for evolution by natural selection. An individual offspring inherits mutations only when mutations are present in parental egg or sperm cells germinal mutations.

Mutations in DNA occur for different reasons. For example, environmental factors, such as exposure to ultraviolet radiation or certain micals, can induce changes in the DNA sequence.

Mutations can also occur because of hereditary factors.

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