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Scientific Study from the year 2016 in the subject Biology - Genetics / Gene Technology, , language: English, abstract: The study we first calculated the level of spontaneous mutagenesis population of Yemen Republic residents, which amounted to 1,12 ± 0,09 per 100 cells. The main type of aberrations in this were single fragments (0,69 ± 0,10%), which occurred twice as often paired (0,35 ± 0,07%). Chromosomal exchanges and chromatid exchanges occurred at a frequency 0,02 ± 0,02% and 0,08 ± 0,04% at 1.96% of the population. In the analyzed material was observed dysenteric chromosomes interchromatid, interchromosomal exchanges, which may indicate the absence of the effects of radiation and chemicals above background.