4.0kb Xba-BamHI genomic fragment including the Fs(2)Ket promoter and the 5' segment of the coding region is fused to a 2.3kb cDNA fragment that corresponds to the rest of the transcribed part of the Fs(2)Ket gene.
The dominant female sterility of Fs(2)Ket2 is slightly rescued by Fs(2)KetIII; approximately 1% of eggs laid by females progress to the stage of embryonic cuticle formation.