• The majority of mutations have neither negative nor positive effects on the organism in which they occur.
  • These mutations are called neutral mutations.
  • Harmful mutations may cause genetic disorders or cancer.
  • Beneficial mutations are essential for evolution to occur.
  • They increase an organism’s changes of surviving or reproducing, so they are likely to become more common over time.
  • A genetic disorder is a disease caused by a mutation in one or a few genes.
  • A mutation in a single gene causes the body to produce thick, sticky mucus that clogs the lungs.
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