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 ?
According to the International Survey of Herbicide Resistant Weeds (weedscience.org), since the first confirmed report of a resistant biotype in 1957, herbicide-resistant weed biotypes have been reported in at least 60 countries and include more than 400 unique species-herbicide group combinations (fig.
Characterization of Vibrio cholerae O1 El Tor biotype variant clinical isolates from Bangladesh and Haiti, including a molecular genetic analysis of virulence genes.
In this study we tried several different types of primer pair but only B biotype and Q biotype specific primers produced amplified bands.
Part of the discrepancy may be due to methodology and the level of susceptibility in the susceptible biotype to which resistant biotypes were compared.
Key words: Dentogingival complex dimension, Gingival biotype
The different body architecture showed by the Creole goat biotype compared to the existing breeds and hybrids on this same semi-arid area, allows us to consider the possibility to rescue an Iberian origin type of goat with a long adaptation to the agroecological and geographical conditions of these semi-arid area.
Replication of a research finding by investigators across the world can be quite challenging because of the variable composition of biotypes in different countries.
In researches that compared the relative growth and seed germination of Bidens subalternans (Beggarticks) of susceptible and resistant biotypes to ALS inhibitors, under different temperature conditions, there was no difference in the relative growth rate between the biotypes studied; but the germination rate of the resistant biotype was lower than that of the susceptible population (Lamego et al., 2011).
A colony was established with apterous adult females (biotype 1) collected in 2007 from commercial soybeans near the University of Nebraska, Haskell Agricultural Laboratory (Dixon County, Concord, Nebraska, USA) (42.3841[degrees]N, 96.9891[degrees]W).
Echeverria-Echeverria et al., "Biotype, antibiotype, genotype and toxin gene tsst-1 in Staphylococcus aureus isolated from Cotija cheese in the state of Guerrero, Mexico," African Journal of Microbiology Research, vol.