Mutation - A change or damage in the DNA gene that permanently alters the genetic message., Mutagen - a physical or chemical substance that can cause a change in DNA, Substitution - mutation caused when replacing a sequence of bases, Insertion - mutation caused when adding a base, Deletion - mutation caused when removing a base, Chromosome - A single, highly organized and structured piece of DNA, Gene - The basic physical and functional unit of heredity made up of DNA, Neutral mutation - A mutation in DNA that does not affect the organisms life functions, Sexual reproduction - Reproductive process involving two parents whose genetic material is combined to produce a new organism different from themselves, Genetic variation - The occurrence of an organism, trait, or gene in more than one form,

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