Imprecise excision of the P{lacW} element, resulting in an approximately 2.5kb deletion which removes part of the 5'UTR and upstream control and promoter region.
Heterozygotes have short bristles, a reduced body size and a 4 day delay in eclosion. A partial cleft extending anteriorly from the scutoscutellar suture is seen on both sides of the scutum. Homozygotes die as second and early third instar larvae.
RpS21R12 is rescued by RpS21+t2.8
One copy of RpS21+t2.8 rescues the RpS21R12 Minute phenotype. The lethality of RpS21R12 homozygotes is rescued by two copies of RpS21+t2.8.
Selected as: a w- revertant.