phl11 sl1 double mutant cells are generally located at the rear of the cluster during border cell late posterior migration and dorsal migration in mosaic border cell clusters consisting of both wild-type and mutant cells.
In hemizygous mutants the average number of R7s is 1.3. Heterozygous Gap1B2/+ in combination with sl1 show more than 80% of ommatidia with multiple R7 cells. Average number of R7 cells per ommatidium is 2.2.
Eye supernumerary R7 cell phenotype of sl1 and sl2 is almost completely suppressed by reducing the dosage of Egfr, as in heterozygotes for Egfrf2 and Egfrf3. Double mutants of sl1 or sl2 with either sev1 or sev14 show a mutant phenotype intermediate to that of either single mutant: 35-49% of ommatidia have one R7 cell, 6-12% contain two R7 cells and the rest have no R7 cells. Double mutants with sl1 or sl2 and rl1 show phenotypes very close to that of rl1 alone. Double mutants of sl1 with sina2 show no increase in proportion of R7 cells over that seen for sina2 alone.
Complementation data based on rough eye and wing phenotypes.
Bridges, 21st Dec. 1915.