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Definition: A component of Darwin's evolutionary theory postulating that evolution occurs by the temporal accumulation of small, incremental changes in populations, usually across very long periods of geological time; it opposes claims that evolution can occur by large, discontinuous or macromutational changes. changes.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.