Levchuk L. Adoptability of Drosophila melanogaster genotypes after artificial chromosome substituion.

The thesis is devoted to the influence of reciprocal interline chromosome substitution on individual indices of adaptivity in D. melanogaster. The information has been revealed about the level of relative adaptivity (W) and other traits of adaptive ability (real fertility, thermoresistance, duration of life, survival under starvation) in genotypes after chromosomes 1, 2 and 3 substitution. Functional state of ADH gene-enzyme system as well as the existance of correlation between certain adaptability indices has been ascertained after chromosome substitution. It is determined that the chromosome exchange within C-S, cn and vg lines causes, as a rule, the decrease of genotype adaptive potentinal and, in a number of cases, is accompanied by the modification of ADH alozyme characteristics. The main cause of pointed out changes is the existance of marker mutations as well as disturbances of gene equilibrium under artificial genotype reconstructions.