Convergence
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convergence -- Similarities which have arisen independently in two or more organisms that are not closely related. Contrast with homology.
Convergence
Cynthia Needham (ICAN Productions)
Produce a treatment for a proposed public TV documentary on nanotechnology, especially nanotechnology that involves biology.
Convergence: The contact at the sea surface between two water masses converging, one plunging below the other.
Convergence
The evolutionary development of similar external morphological traits in organisms which are unrelated (except through distant ancestors) as each adapts to a similar way of life and/or environment.
The convergence of the availability of serious amounts of money in the 70's, ...
Premature convergence does occur in nature (where it is called genetic drift by biologists).
morphological convergence The evolution of basically dissimilar structures to serve a common function. For example: the wings of birds and insects.
morula The solid-ball stage of the pre-emplantation embryo. PICTURE ...
Phenetic classifications are plagued by problems of convergence and parallelism, but are useful in their attempt to objectify the classification process.
See convergence.
Related Terms:
Convergence
The evolutionary development of similar external morphological traits in organisms which are unrelated (except through distant ancestors) as each adapts to a similar way of life and/or environment.
These eminences are separated by three notches: one in front, the pubic arch, formed by the convergence of the inferior rami of the ischium and pubis on either side.
Several rod cells synapse with one relay cell → retinal convergence
Impulse by summation \ rod cells collectively cause generator potential
Poor visual acuity but high sensitivity to dim light
Cone cells are working in bright light ...
[L. primitus - at first]. Longitudinal cleft formed on surface of amniote blastodisc by a convergence of cells. Gastrulation begins as epiblast cells migrate towards and into the streak.
Examples of convergence are: fins or fin-like structures in fish, cuttlefish and whales; extreme similarity in alarm calls by five small birds; endothermy in dogs and ducks, wings of butterflies and birds.
The focusing coil in the yoke controls the convergence of the electron beam. The H- and V-deflection coils deflect the electron beam so that it sweeps the target or phosphor in a standard video raster. Two items of the same kind.
Pachydermata was found to be polyphyletic because elephants and rhinoceroses arose separately from non-pachyderms. Evolutionary taxonomists consider polyphyletic groups to be errors in classification, often occurring because convergence or other ...
In any given region, though, the species in the final, self-sustaining climax forest are the same. The tendency for all plant communities to end in the same climax community is called convergence.
Convergence: phenotypic similarity in distantly related (or unrelated) forms, presumably in response to similar selective pressures.
 See also: Organ, Evolution, Life, Trans, Character
  
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