Biology / Bio 1305 · Atom · ~20 seconds
"A DNA Mutation Is Always Harmful"
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A DNA mutation's effect ranges from harmful through neutral to occasionally beneficial, since silent mutations change nothing and many missense changes barely affect function.
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A silent mutation leaves a protein's sequence unchanged, while a rare beneficial mutation can improve its function.
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Mutations are raw material evolution acts on precisely because their effects vary — treating every mutation as harmful ignores this range.