[The genetic determination and function of RR-proteins--the regulators of photoperiodic reaction and circadian rhythms in plants].

The present review devoted to the analysis of recent literature on genetic determination and the domain organization of the newly discovered two-component signaling systems in pro- and eukaryotes. These structures are involved in the regulation of numerous morphological and physiological processes in plants. RR-proteins, it the key elements of signaling systems, they launch a cascade of phosphotransferase reactions and directly or indirectly regulate the transcription and activity other proteins, including enzymes, in response to hormones or environmental factors.

[Stability of genetic parameters in Drosophila melanogaster populations from Odessa city].

The dynamics of allele frequency of the carboxiesterase gene, the frequency of sex-linked lethal mutations, and recombination events in natural populations of Drosophila melanogaster from Odesa were studied. All studied estimates were shown to remain unchanged in June, July, and August during the 2009 collection season.

[Chromosome substitution and genotype adaptation in Drosophila melanogaster].

The subject of research was the relative adaptability and some of its components (fertility, heat resistance, longevity under the normal conditions and under the conditions of starvation) of the line flies D. melanogaster (C-S, cn, vg) and derived forms received in the result of reciprocal substitution of chromosomes 1, 2 and 3. The experiments performed, showed that the intrusion of the alien chromosomes into the karyotype of analysed line flies caused the decline in adaptability index in the most variants of experiment.