Some Genetic Effects of the Combined Electromagnetic and Chemical Pollution of the Biosphere
The effects of some heavy metals (HM) the first class of danger (Pb, V, Co) and the near-infrared (λ = 890 nm) low-intensive pulse laser radiation (LPLR) on the crossing-over in some segments of the second chromosome of Drosophila melanogaster females were studied. The changes of fertility of the heterozygous females D. melanogaster, who were сultivated on the nutrient medium containing HM, and the changes in sex ratio and marker genes (b, cn, vg - II chromosome) in their offspring were found. Pb and V in certain concentrations caused changes in the frequency of meiotic recombination in females subjected individually or combined action of these HM. Biological efficiency of the studied compounds HM had differentiated depending on the concentration HM, individually or combined their actions, and physiological condition of object of research. LPLR in doses 1,2231 and 1,9875 J/cm <sup>2</sup> in some cases showed the modifying effect on the backdrop of Pb (30-10 <sup>-3</sup> %) or V (5-10 <sup>-3</sup> %), expressed in the change of the values of some indicators in comparison with the results of individual application of these factors.