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A genetic '''mutation''' occurs when mistakes are made during copying/[[reproductive success|reproduction]] of DNA and/or chromosomes. | A genetic '''mutation''' occurs when mistakes are made during copying/[[reproductive success|reproduction]] of DNA and/or chromosomes. | ||
Mutations may be bad for the organism, or neutral, or benefit the organism. Mutations are unavoidable and they are necessary for evolution to work at all. Mutations try out new phenotypes and the environment and [[sexual selection]] determine which phenotypes will be prevalent in future and which mutations will become fixed (meaning highly prevalent in the gene pool). | Mutations may be bad for the organism, or neutral, or benefit the organism. The majority of mutations are neutral.<ref>http://www.talkorigins.org/faqs/mutations.html#Q1</ref> Mutations are unavoidable and they are necessary for evolution to work at all. Mutations try out new phenotypes and the environment and [[sexual selection]] determine which phenotypes will be prevalent in future and which mutations will become fixed (meaning highly prevalent in the gene pool). | ||
Older parents produce more mutated offspring.<ref>https://www.bionews.org.uk/page_96182</ref> | Older parents produce more mutated offspring.<ref>https://www.bionews.org.uk/page_96182</ref> | ||