GENETIC MARKERS: COMPARATIVE CLASSIFICATION OF MOLECULAR MARKERS

With the creation of the molecular markers allowing to carry out analysis of genotypes on the level initial genetic information – DNA, onset one of the most multifarious and one of the most large in number class of markers at the present day. It is concerned with that each separate nucleic acid sequence is unique on its structure. Set of molecular and genetic methods, named as DNA-fingerprinting, most wide used in modern investigations for solving different problems in different biological areas. In this connection, necessity in comparative classification of modern molecular and genetic markers is actual. Based on published literature material it shown data on different classifications of molecular markers. Determined definition of term “marker” in genetics and breeding. Gave the characters and distinctive features of genetic markers. It given the definition what is “good” genetic marker as well as kinds, categories, variations and types on heredity of molecular markers. Manifested by means of molecular markers polymorphisms can classified on polymorphism of sequence itself (including nucleotide substitution and insertion-deletion) and polymorphism the number of tandem repeat sequences in repeated regions. Moreover, molecular markers can classify on two variations: anonymous, for which nucleotide acid sequence unknown and for manifestation of the molecular marker its detection not necessary (for example, RAPD, AFLP, RFLP), and announce (or determined), for which nucleic acid sequence is known or can be detect during analysis (for example, SNP, CAPS, STS). However, in independence on using of molecular markers the choice of method of investigation will be depend on investigated plant species as well. The next influence of molecular and genetic methods on genetics and practical breeding of plants will be depend on results, which will be obtain, in particular, on revealing the possibility or not possibility of genotyping of individual on single genetic marker as wel as on economic price of obtain informative data.

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