Temperature sensitive period during embryogenesis.
Homozygous lethal at all temperatures. l(2)DTS191/+ flies die when raised at 29oC, but survive development at 25oC. l(2)DTS191/+/+ heterozygotes survive development at 29oC. The temperature-sensitive period of the heterozygote is 115-120 hours, the lethal phase is later than 210 hours of development. Eclosion is incomplete.