Lethality occurs during the third larval instar.
Half of the embryos from females triple heterozygous for CCT6G0057, Df(2L)Exel6034 and Df(3R)Exel6191 display a delay in furrow formation compared to controls.
The proportion of embryos displaying a delay in furrow formation increases from 25% observed for embryos derived from Fmr13/Df(3R)Exel6265 females to 75% observed for embryos from females that are also heterozygous for Df(2L)Exel6034.
P{lacW} not verified as causing the lethality.