Properties of norm and variability

Properties of norm and variability Data of the authors from many years on the two ways of development of a group of offspring of tailless amphibians—development with the effect of the norm of characteristics and development with the effect of mass anomalies of a number of characteristics—are summarized. Mass anomalies of limbs in the African clawed frog Xenopus laevis were obtained in laboratory (without using any special influences). They represent a syndrome when the structure of limbs and their girdles, as well as the sacral part of the spine, change correlatively. The syndrome has several stages of manifestation (according to the degree of intensification of deviations from the norm). The maximum manifestation of the syndrome produces a change in the norm of the structure of the sacral part. It was shown that change in the rule of its variability precedes change in the norm of the structure of the sacrum. Not having an opportunity of observing the process of evolution directly (change in norms on the large scale of time), we have to use any data (even indirect), which can give us information on how the change in the norm takes place and what happens to the variability. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Developmental Biology Springer Journals

Properties of norm and variability

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2011 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Developmental Biology; Animal Anatomy / Morphology / Histology
ISSN
1062-3604
eISSN
1608-3326
D.O.I.
10.1134/S1062360411020093
Publisher site
See Article on Publisher Site

Abstract

Data of the authors from many years on the two ways of development of a group of offspring of tailless amphibians—development with the effect of the norm of characteristics and development with the effect of mass anomalies of a number of characteristics—are summarized. Mass anomalies of limbs in the African clawed frog Xenopus laevis were obtained in laboratory (without using any special influences). They represent a syndrome when the structure of limbs and their girdles, as well as the sacral part of the spine, change correlatively. The syndrome has several stages of manifestation (according to the degree of intensification of deviations from the norm). The maximum manifestation of the syndrome produces a change in the norm of the structure of the sacral part. It was shown that change in the rule of its variability precedes change in the norm of the structure of the sacrum. Not having an opportunity of observing the process of evolution directly (change in norms on the large scale of time), we have to use any data (even indirect), which can give us information on how the change in the norm takes place and what happens to the variability.

Journal

Russian Journal of Developmental BiologySpringer Journals

Published: Oct 6, 2011

References

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