Abstract
Study of individual cell morphemes in animals has fundamental and applied meaning. The principle issue of modern biology is mechanistic study of functioning and cooperation of nucleus cell structures. Real interest is in- depth study of nucleus cell structure, connected with proliferative and synthetic cell activity in animals. Parts of chromosomes contain specialized structures- so called nucleolar organizers (NOR). Number of these subunits polymorphous and depends on complex of factors. Principle facto , influencing the number of NOR, is a specific accessory and individual features of the body. In NOR zone genes of 2 classes of rRNA: 18S and 28S, which are in ribosomes, taking part in their functioning. NOR perform functions in cells, take part in protein secretion. The aim of this survey is the analysis of NOR polymorphism in domestic and farm animals and identifying economic traits with polymorphism and NOR structure. According to NOR we can implicitly estimate activity of synthesis of ribosomal RNA and distinguish cell- doubling capacity and state of cell differentiation. Metaphase NOR are used as indicator of physiological and productive body state. Cytogenic assays, aimed to study intraspecific animal variety, are carried out on the basis of localization in NOR cells.
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