microevolution


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mi·cro·ev·o·lu·tion

(mī'krō-ev'ŏ-lū'shŭn),
The evolution of bacteria and other microorganisms through mutations.

microevolution

(mī′krō-ĕv′ə-lo͞o′shən, -ē′və-)
n.
Small-scale evolution consisting of genetic changes occurring usually within a single species and over a shorter period of time than in macroevolution.

mi′cro·ev′o·lu′tion·ar′y adj.

microevolution

A 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.

microevolution

the 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.
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References in periodicals archive ?
Examples are frequently given of obvious examples of microevolution, and then are used to claim evolution (meaning macroevolution) has been proven.
Benedict's affirmation of microevolution while denying macroevolution to escape materialist philosophy won't work (NCR Sept.
Fahling argues that unlike creationism, ID is a science based on the theory of microevolution, which contends that major changes can occur within a species.
Early on, I read about the differences between microevolution and macroevolution, enough to know that no one disagrees with microevolution, which generally refers to small changes in existing species or gene pools, such as changes in the size of finch beaks or the development of antibiotic resistance.
The central question of the conference was whether the mechanisms underlying microevolution, seen as changes within a population, can be extrapolated to explain the phenomenon of macroevolution, seen as changes above species level leading to the origin of new species.
Major features of sudadonty and sinodonty, including suggestions about East Asian microevolution, population history and late pleistocene relationships with Australian aboriginals.
Horizontal gene transfer to other soil bacteria and microevolution of plasmids was observed.
In scientific parlance: natural selection accounts for macroevolution as well as microevolution.
Oller, 1988) called microevolution, which can be defined as natural drift within limits.
Quantitative genetics and selection in natural populations: microevolution of vertebral numbers in the garter snake Thamnophis elegans.
at the periphery, strongly asymmetric gene flow stymies microevolution, forces the terminus of the range, and maintains populations that are poorly adapted to the conditions they inhabit (Kirkpatric and Barton 1997).
Behavioral genetics and the fine structure of mouse populations: a study in microevolution.