cline

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cline

(klīn),
A systematic relation between location and the frequencies of alleles; lines connecting points of equal frequency are termed isoclines, and the direction of the cline at any point is at right angles to an isocline.
[G. klinō, to slope]
Farlex Partner Medical Dictionary © Farlex 2012

cline

(klīn)
n.
A gradual change in a character or feature across the distributional range of a species or population, usually correlated with an environmental or geographic transition.

clin′al (klī′nəl) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

cline

a gradual and continuous (or nearly continuous) change in a character (such as size or colour) in relation to its geographical or ecological distribution. For example, there is an increase in the percentage of bridled forms in the guillemot population with more northerly latitudes.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
RFLP haplotype frequencies vary clinally along the coastline for 2 of 3 mtDNA regions surveyed (Figs.
Covariation of the three variables under study would suggest that the observed patterns of call variation result from patterns of gene flow that are strong enough to mask selection effects, although there could be alternative explanations such as an evolutionary response to clinally varying selection (also see Endler 1977).
Recombinant chromosomes are clinally distributed and weaken barriers to gene flow by providing a bridge between the two parental types.