[Selected plateau during long-term selection in experimental populations of Drosophila]. / Selektsionnoe plato pri dlitel'nom otbore v éksperimental'nykh populiatsiiakh drozofily.

Drosophila subpopulations which did not any more response to the artificial selection effect were obtained as the result of long-term selection for the number of abdominal bristles and thorax length. Study on selection lines has shown that genetic variability may both decrease in the process of selection and increase temporarily. Not always does fixation of alleles controlling a quantitative character occur when the selection limits are achieved.

[Dynamics of quantitative traits of Drosophila during long-term selection]. / Dinamika kolichestvennykh priznakov drozofily pri dlitel'nom otbore.

The results of long-term mass selection for the number of abdominal bristles and thorax length in Drosophila population during over 60 generations in opposite directions are given. It is shown that effectiveness of selection depends upon additive genetic component of phenotypic variability of characters in the initial population.