The bilateral asymmetry of the number of bristles in Drosophila occurring under the influence of methotrexate

: The data are analyzed on the bilateral asymmetry of the number of dorsal and scutellar chaeta observed under the action of methotrexate in Drosophila of wild strain. It was shown that the incidence of asymmetric specimens induced by methotrexate was abruptly increased as compared to the control. The asymmetry was found to have a statistically significant trend to left side both of the control and the variants of treatment. There was no sex difference revealed between targets of the asymmetry.