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Mutations may be beneficial, neutral or deleterious (bad) for the organism. Around 95% of mutations have no significant immediate effect or are neutral, and most remaining ones are deleterious.<ref></ref><ref></ref> Mutations are unavoidable and they are necessary for evolution to work at all. Natural and [[sexual selection]] decide which phenotypes will be prevalent in future generations and which mutations will become fixed (meaning highly prevalent in the gene pool).
Older parents produce more mutated mutations in their offspring.<ref></ref> There is also evidence that the mutation rate is much higher in human males (up to 6 times higher), which has also been found in other species such as birds.<ref></ref><ref></ref> This has lead to a hypothesis of evolution being largely driven by mutations in the male germline. This finding is heavily contested however.
== Kinds of mutations that can occur ==

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