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Mutation is the change in the DNA of an organism. ... The rate of mutation can be increased by environmental mutagens, such as X-rays, but most mutations are internal errors within the organism, rather than externally caused. ... Evolution occurs when a new version of a gene, which originally arose by mutation, increases in frequency and spreads through the species by natural selection or random genetic drift (chance fluctuations in gene frequencies). ... Without mutation, however, species would not evolve.
Whether or not a mutation spreads depends on whether it improves the quality of the organism containing it (advantageous mutation); makes no difference to the organism (neutral mutation); or reduces the quality of the organism (disadvantageous mutation).
Approximate Word count = 415
Approximate Pages = 1.7
(250 words per page double spaced)
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