Nucleotide sequences of the mutant and non-mutant fragments of loci A and C of alleles of double low (00) fad3 form desaturase gene and low-linolenic mutant (LLMut) of oilseed rape plants (Brassica napus L. var. Oleifera), allospecific SNP markers specific for loci A and C of fad3 form desaturase gene - double low (00) and low-linolenic mutant (LLMut) of winter oilseed rape plants, nucleotide sequences of primer pairs for the amplification of loci A and C of fad3 form desaturase gene of winter oilseed rape plants, method for amplification of loci A and C of fad3 desaturase gene of winter oilseed rape plants, nucleotide sequences of the primers for the identification of mutant and non-mutant alleles of fad3 forms desaturase gene - double low (00) and low-linolenic mutant (LLMut) of oilseed rape in locus A and locus C in the microsequencing reaction, method for the identification of mutant and non-mutant alleles of fad3 form desaturase gene - double low (00) and low-linolenic mutant (LLM