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  • changes in the nature of single genes or segments of chromosomes, which are then passed on (inherited); produces variation
  • an abrupt heritable variation, a result of an alteration of a gene or a chromosome, abrupt hereditary change
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • the process of changing one allele into another
    Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
  • An alteration in DNA structure or sequence of a gene.
  • A mutation is a change in a DNA sequence. Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals called mutagens, or infection by viruses. Germ line mutations occur in the eggs and sperm and can be passed on to offspring, while somatic mutations occur in body cells and are not passed on.

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