Insertion of P{SUPor-P} into intron 1 of Gap1, in reverse orientation.
anaphase & condensed nuclear chromosome
mitosis & nuclear chromosome
Dominantly decreases transmission of Dp(1;f)J21A to offspring to 10%. Recessive lethality acts in the embryonic/first larval instar stages. Larval neuroblast squashes reveal precocious sister chromatid separation and aberrant anaphase figures.