Maternal effect repression of gonadal dysgenic sterility (sterility = 2.3%). No detectable repression of transposition in snw mutability assay.
Homozygotes are lethal. Progeny derived from mothers or fathers carrying the modified P-element exhibit a dramatic inhibitory effect of transposition in the soma causing a repression of somatic P{hsP} excision events so eyes have 0-10% white area.
Homozygous lethality has not been shown to be due to the transposon itself. Other insertions of the transposons have a wild type phenotype and do not repress transposition of P{hsP}.
P-element 66kD protein is expressed.