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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.