Question: Name 9. A Genetic Screen Identified A Mutant That Caused Specific Loss Of Photoreceptor (PR) R7, And This Gene Was Named Sevengone (ska). To Examine Whether Sug Is Required Cell-autonomously For R7 Specification, You Generated Mutant Clones In Which Cells Are Mutant For Both White (w) And Skg. You Examined Mosaic Ommatidia (4 Examples Are Shown In A) …

Name 9. A genetic screen identified a mutant that caused specific loss of Photoreceptor (PR) R7, and this gene was named sevengone (ska). To examine whether sug is required cell-autonomously for R7 specification, you generated mutant clones in which cells are mutant for both white (w) and skg. You examined mosaic ommatidia (4 examples are shown in A) in which some PRS are wild type (w+ sina+, shown as a filled circle with a white number), and some PRs are mutant (w- sina-, shown as open circle with black number). The results for 100 ommatidia are summarized in Table1. A Table 1. Number of ommatidia in which a certain Does sug function cell- 3 3 PR is w+, w- or missing autonomously in R7 or not? Please PR type w+ W- missing explain (3pts). 5 5 2 2 8 8 R1 30 70 6 1 600 R2 53 47 R3 62 38 66 5 2 5 R5 2 51 49 8 R6 37 63 6 1. R7 0 4 4 3 R4 34 4) 4. 8 600 65 35 R8 48 52 Which signaling pathway is skg likely to be a downstream component of? (2pts)