microevolution


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

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.
Mentioned in ?
References in periodicals archive ?
As the reader may suspect, the authors themselves are creationists rather than evolutionists, who acknowledge that the empirical evidence of the age of the universe suggests billions of years, rather than thousands and affirm the process of microevolution, which has lead to the significant, but relatively small changes that occur within, for example, genera and families.
Further evidence indicated that microevolution accumulates over time to account for all larger degrees of evolutionary diversification (macroevolution).
In other words, macroevolution is nothing but multiples of microevolutions.
Equally absurd is using evidence for microevolution (finch A evolves to finch B) to justify macroevolution (primate A evolves to man).
Woodbury, he concludes that neither the fossil record nor the fact of microevolution justifies the enthusiastic conviction, so common in the academy and even the popular culture, that macroevolution is the case.
Oller, 1988) called microevolution, which can be defined as natural drift within limits.
Abrams said he submitted his own set of standards because the committee refused to differentiate between microevolution, the idea that living things adapt to survive, and macroevolution, the theory of origins that links humans to apes.
Whole genome sequencing analysis of intrapatient microevolution in Mycobacterium tuberculosis: potential impact on the inference of tuberculosis transmission.
As generally in evolutionary biology, it seems important to combine the levels of macroevolution and microevolution (Wagner, 1986; Friedman et al.
In the early years of my career I, like many other biology teachers, struggled with the idea of teaching evolution partly because my own strong Christian beliefs often conflicted with many of Darwin's ideas; yet evidence for evolution, especially microevolution, was overwhelming.
Few people dispute this process--commonly labeled microevolution, although Colling does not use that term--because science can document that it happens here and now.
1) It is clear from last week's testimony as well as the scientific literature that there is a continuing controversy over whether microevolution (changes within existing species and gene pools) can be extrapolated to explain macroevolution (the origin of new species, organs and body plans).