The lethality of females carrying hhb.PP is greater than 80%.
Causes female lethality (FBrf0051358).
More than 99% of hhb.PP females die as embryos, with head defects.
Females have defective mouthparts.
SxlM1 completely suppresses female lethality.
hryhb.PP partially rescues hryunspecified
Parkhurst.