Polytene chromosomes normal (Judd).
First instar larvae do not grow. Mosaic analysis demonstrates mutant phenotype is non-autonomous, clones survive as sectors of mutant tissue only in the abdomen. Individuals survive when Dp(1;4)wm65g or Dp(1;3)wm49a is present (at 25oC but not 18oC). Surviving males are phenotypically normal and fertile.
Lethality acts in the first instar stages. Growth slight. A few reach second instar but fail to grow further. Survive as XY but not as X0 males in presence of either Dp(1;4)wm65g or Dp(1;3)wm49a.
Judd, 13 March 1963.