Biotype


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biotype

[′bī·ə‚tīp]
(genetics)
A group of organisms having the same genotype.

Biotype

 

a group of organisms, part of a local population, which have the same genotype and are similar in practically all respects. The Danish biologist W. Johannsen (1909) considered the homozygotic biotype in self-pollinating plants to be the most elementary structural unit of a population. The Soviet botanist V. N. Sukachev (1927, 1935) called clones of plants that were derived by numerous root grafts of the plant or by division of a single bush “biotypes.” In populations of cross-pollinated species, biotypes can be distinguished both as successive selection with isolation of the offspring and as manyfold multiplication in close degrees of relation (inbreeding). In the 1920’s and 1930’s many biologists (the Swedish botanist G. Turesson; the Soviet biologists N. I. Vavilov, M. A. Rozanova, and others) considered biotypes to be the smallest taxonomical unit. Species, in their opinion, arose from combination of biotypes as a result of recombination and selection.

Large groups of organisms, often consisting of many species and characterized by similar adaptation to the exploitation of definite habitation conditions, are also called biological types or life forms. In this sense, for example, the group of underground burrowing rodents, the group of ephemeral desert plants, and so on are taken to be biological types.

REFERENCES

Berman, Z. I., K. M. Zavadskii, A. L. Zelikman, et al. Sovremennye problemy evoliutsionnoi teorii. Leningrad, 1967.
Zavadskii, K. M. Vid i vidoobrazovanie. Leningrad, 1968.

K. M. ZAVADSKII

References in periodicals archive ?
In the meantime, psychiatric investigators are stratifying schizophrenia into its many endophenotypes, and linking hundreds of schizophrenia biotypes to an array of biomarkers (Table) that can be diagnostic, predictive, prognostic, or useful in monitoring efficacy or safety.
Dr van Helden says the virulence profile of RWAau1 is nearly identical to the American RWA1 biotype which suggests that the origin of the incursion in Australia is either from the United States of America or from the same origin as the original RWA1 that was first detected in Colorado in the USA in 1986.
Production of Yersinia stable toxin (YST) and distribution oiyst genes in biotype IA strains of Yersinia enterocolitica.
Y] plasmid replicon were detected mostly in strains of the pathogenic biotype 4 isolated from human diarrheic feces; however, it did not relate to any acquired resistance genes (Table 1).
Monitoring insecticide resistance in biotype B of Bemisia tabaci (Hemiptera: Aleyrodidae) in Florida.
In our study 106 V cholerae O1 strains were isolated and all of them belonged to biotype El Tor, the predominant serotype was Ogawa.
General biotype distribution of 250 Candida albicans strains before and after exposure to PTR, DTRTA, PHARA BIOTYPES STRAINS ENZYMATIC reference C.
The thicker biotype is more prevalant in general population.
But it is absent in B biotype, lot is still to be discovered about its phenotype (Everett et al.
Florida agriculture is threatened by the Biotype B and Q severely due to the pests resistance against pesticides used to treat whitefly outbreaks.