Semilethal: show csk phenotype.
Semilethal, temperature sensitive period is during embryonic stage. Adult escapers have a small body size and wing defects (wings are turned up or down and the marginal vein is curved). Hatching and pupariation are delayed.
Semi-lethal temperature sensitivity, viability reduced at 29oC, stronger at 25oC, escapes phenotypically normal.
temperature-sensitive
Belyaeva.