microevolution mi·cro·ev·o·lu·tion (mī'krō-ěv'ə-lōō'shən, -ē'və-)
evolution resulting from a succession of relatively small genetic variations that often cause the formation of new subspecies.
|microevolution (mī'krō-ěv'ə-l'shən) Pronunciation Key
Evolutionary change below the level of the species, resulting from relatively small genetic variations. Microevolution produces new strains of microorganisms, for example, or the rise of a new subspecies. The accumulation of many microevolutionary changes results in macroevolution.