[Alkaline phosphatase in Drosophila melanogaster strains differing in male mating activity and their F1 hybrids]. / Shchelochnaia fosfataza u linii Drosophila melanogaster, razlichaiushchikhsia po polovoi aktivnosti samtsov, i ikh F-gibridov.

The activity of alkaline phosphatase (AP) was studied in adults of highly active (HA) and low active (LA) Drosophila melanogaster strains and their F1 hybrids, both under normal conditions and after a heat shock (38 degrees C). Under normal conditions, the HA strain expressed a higher AP activity compared to that in the wild-type strain Canton-S and dominated in respect to this character. The AP activity showed a sexual dimorphism, as it was higher in females of both strains. Heat shock (38 degrees C) induced no alterations in the AP activity of D. melanogaster.

[Genetic control of DFP-sensitive juvenile hormone esterase activity in Drosophila virilis]. / Geneticheskii kontrol' aktivnosti DFF-chuvstvitel'noi ésterazy iuvenil'nogo gormona Drosophila virilis.

Genetic analysis of differences in the activity of DFP-sensitive juvenile hormone esterase in 24-hour-old D. virilis flies was performed. Lines of D. virilis resistant and sensitive to long-term heat stress were analyzed under normal conditions. The level of juvenile hormone hydrolysis by this esterase was higher in the resistant than in the sensitive line. Interlinear differences in the enzyme activity were shown to be controlled monogenically or by a block of tightly linked genes. The allele of the resistant line was dominant.