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The evolution of bacteria and other microorganisms through mutations.
Farlex Partner Medical Dictionary © Farlex 2012
Small-scale evolution consisting of genetic changes occurring usually within a single species and over a shorter period of time than in macroevolution.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
microevolutionA term of art referring to evolution that occurs below the level of speciation, which corresponds to the shifts in allele frequencies occurring over time in a particular population, regardless of whether it is geographically or ecologically separated from another population.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
microevolutionthe small-scale changes resulting from genetic adaptation, that are usually expressed as changes within a species rather than the formation of a new species. see INDUSTRIAL MELANISM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005