means two wildly different things either: (1) diversity at reproduction as a function of heredity performed by DNA function (called “alleles”) and (2) outright genetic errors.
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MUTATIONS ARE GENETIC ERRORS; ERRORS ARE DEGRADATIVE (BAD).
Despite the countless internet sites that claim the opposite, mutations are degradative and deleterious. While a handful of examples can be spun as "good", these too are loaded with side effects and disease.