title: [Effectiveness of selection for thorax length in model Drosophila populations in chemical mutagen exposure].
abstract: Artificial selection for increasing and decreasing Drosophila thorax length was carried out over 20 generations. Chemical mutagen, dimethylsulfate (DMS) was regularly applied to enhance genetic variation in selected lines. It was determined that under the influence of mutagen the efficiency of selection for decreasing thorax length was much higher, while selection course for increasing thorax length was not affected significantly. Regression coefficient of responses to selection, general for males and females, was equal to b = -0.035 +/- 0.004 for lines of negative direction of selection when the mutagen was applied and -b = -0.023 +/- 0.004 without mutagenesis; for lines of positive direction b = 0.026 +/- 0.005 and b = 0.024 +/- 0.005. Fitness component variation by artificial selection was studied. A complex correlation was detected between direction of selection, the shift value of model quantitative character and fitness component variation by selection. The main factor stimulating a sharp drop of average fitness of lines appeared to be the influence of directional artificial selection. The regular treatment by a moderate dose of the mutagen did not affect markedly the average fitness variation of selected lines.
mesh_terms: D000818:Animals; D004330:Drosophila / Q000187:drug effects / Q000235:genetics; D005260:Female; D005828:Genetics, Population / Q000187:drug effects*; D008297:Male; D008957:Models, Genetic; D009153:Mutagens / Q000494:pharmacology*; D012641:Selection, Genetic; D013463:Sulfuric Acid Esters / Q000494:pharmacology; D013909:Thorax / Q000187:drug effects
chemical_list: D009153:Mutagens; D013463:Sulfuric Acid Esters; C007482:dimethyl sulfate
vernacular_title: Effektivnost' otbora po dline grudi v model'nykh populiatsiiakh drozofily pri vozdeĭstvii khimicheskim mutagenom.