Cytogenetic method

Date: 2015-10-07; view: 696.

Cytogenetic method is based on the study of features of chromosomes (karyotype) organisms. Study karyotype allows to detect mutations associated with changes in both chromosome number and structure of some of them. Karyotype examined in cells at metaphase, because in this period of the cell cycle structure of chromosomes is expressed most clearly.

This method is used in the taxonomy of organisms (kariosystematyka). Yes, many species dviynyyuv (species that are difficult and sometimes even impossible to recognize in other features) are distinguished by karyotype. Such cases are known among insects, amphibians, rodents, etc.. For example, in the 30-ies of XX century scientists viewed at different frequencies diseases malaria in adjacent areas. Research mosquito karyotype showed that this is not one kind, as previously thought, and the complex of sibling species, some of which carry malaria parasites, and others - not.