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 ?
How can a molecule with a putative mechanism of action relevant to a specific biotype be administered to a hodgepodge of heterogeneous biotypes that have been lumped in 1 clinical category, and yet be expected to exert efficacy in most biotypes?
Australian scientists have confirmed that the Russian Wheat Aphid (RWA) now established throughout parts of the nations south-eastern cropping regions is a single biotype.
Moreover, less genetic diversity is expected in samples of resistant biotypes that have been under selection due to the recurrent use of herbicides.
Production of Yersinia stable toxin (YST) and distribution oiyst genes in biotype IA strains of Yersinia enterocolitica.
pestis" isolated from 1979 to 2012, based on the resistance profiles found for some other strains of the biotypes mentioned above in previous studies of our group.
Q biotype whiteflies, more properly known as Bemisia tabaci Mediterranean (MED) and classified as B.
Since antibiogram of isolates keeps changing depending on, change in biotype and serovar, careful epidemiological monitoring of circulating strains is recommended.
Biotypes of fungi isolated from patients with oral cavity diseases.
Thin biotypes are delicate, highly scalloped and translucent in appearance.
One possible reason is the presence of different biotypes of vector and the presence different of endosymbionts in whiteflies which ultimately produces different type of GroEL which have different level of affinity with different coat proteins of viruses.
Reports are showing that high populations of Biotypes B and Q in landscapes show no sign of haltering after pesticide treatments.