variation

(redirected from phenotypic variation)
Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.
Related to phenotypic variation: Phenotypic variance

var·i·a·tion

(var'ē-ā'shŭn),
1. Deviation from type, especially the parent type, in structure, form, physiology, or behavior.
2. Synonym(s): type (3)
[L. variatio, fr. vario, to change, vary]

variation

/var·i·a·tion/ (var″e-a´shun) the act or process of changing; in genetics, deviation in characters in an individual from the group to which it belongs or deviation in characters of the offspring from those of its parents.
antigenic variation  a mechanism by which parasites can escape the immune surveillance of a host by modifying or completely altering their surface antigens.
microbial variation  the range of characteristics with a species used in identification and differentiation.
phenotypic variation  the total variation, for whatever cause, observed in one character.

variation

(vâr′ē-ā′shən, văr′-)
n.
1.
a. The act, fact, or process of varying.
b. The extent or degree to which something varies: a variation of ten pounds in weight.
2. Biology The existence within a species or other group of organisms of differences in form, function, or behavior, especially when hereditary.

var′i·a′tion·al adj.

var·i·a·tion

(var'ē-ā'shŭn)
Deviation from the type, especially the parent type, in structure, form, physiology, or behavior.
[L. variatio, fr. vario, to change, vary]

variation

  1. ecophenotypic variation (see ECOPHENOTYPE caused by local factors, as opposed to genetic factors, in an organism.
  2. any differences (both genotypic and phenotypic) between individuals in a population or between parents and their offspring. see GENETIC VARIABILITY.

variation (genetic),

n deviation from the genotype in structure, form, physiology, or behavior.

variation

divergence among individual animals of a group. The differences in the morphology or function of an organ or organism, are small enough to stay within the variability of the type organism or organ.
References in periodicals archive ?
Phenotypic Variation in Sensitivity of Activity to Lead Exposure in the DGRP
To overcome this obstacle, plant geneticists and breeders are turning to agricultural and biological engineers for sensor deployment solutions and information technologies that can rapidly quantify the phenotypic variation of genetically diverse plant populations in field conditions.
Inherited epigenetic variants can interact with their genetic counterparts to multiply by orders of magnitude the phenotypic variation available to natural selection, thereby expanding the mechanistic basis of evolutionary theoretical explanations and greatly increasing their plausibility as an account of life's diversity.
The synthetic theory is based mainly on population dynamics, on the correlation of phenotypic variation with statistical gene frequencies in populations, whereas evo-devo explains phenotypic change through alterations in developmental mechanisms, whether they are adaptive or not.
Of course, a combination of several of these causes is usually responsible for quantitative phenotypic variation.
In recent years, as this book illustrates, the consensus view of evolution has softened again, in response to research suggesting additional sources for phenotypic variation beyond minor genetic alterations and preexisting diversity in the gene pool.
We therefore explored sequence differences in potential genetic clusters of this phenotypic variation and also investigated the functional differences between the 2 phenotypes.
However, unless researchers can rule out or adjust for the possible effect of such plasticity, within-generation experiments may be insufficient to evaluate the genetic basis of the focal phenotypic variation.
Therefore the presence of phenotypic variation resulting from chromosome constitution may produce further intraspecific body-size variation on which selection may act.
Two possible hypotheses were considered: (1) hybridization had occurred between Pacific and Californian abalone and (2) phenotypic variation within H.
The estimation of the position, genetic effects, and percentage of phenotypic variation of the QTL were performed at the significant LOD peak in the region under consideration.