A substantial internal portion of the P{lacW} element has been removed.
Heterozygous females show high levels of achiasmate X chromosome nondisjunction, but the mutation has no or little effect on the segregation of chiasmate X chromosomes. Heterozygous females also show elevated levels of 4th chromosome nondisjunction (most of these 4th chromosome nondisjunction events are a secondary consequence of failures of X chromosome missegregation).
αTub67CP40Δ has abnormal meiotic cell cycle | dominant phenotype, suppressible by nod3
The meiotic defects of heterozygotes are strongly suppressed if they are also heterozygous for nod3.