Maternal and paternal effects on thermosensitivity of the l(1)ts403 embryos in Drosophila melanogaster

High thermosensitivity of early embryos controlled by mutation l(1)ts403 wi th disturbed heat-shock response was studied. Thermosensitivity was examine d in early (0-1 h) and late (3.5-4.5 h) embryos obtained by reciprocal cros ses and backcrosses. It was shown that mutation l(1)ts403 lacks maternal ef fect. In progeny of reciprocal crosses, early embryonic thermosensitivity w as intermediate with regard to that of progeny obtained by interlinear cros ses. In early embryos of Drosophila, zygotic genes are not expressed and he at-shock protein synthesis is not induced. Based on this, it was proposed t hat the product of gene l(1)ts403, which affects early embryonic thermosens itivity, is transmitted both paternally and maternally and shows dosage eff ect.