Packet 5: Tossup 5

In these structures, the transcription factor Glass synergizes with EGFR signaling mediated by the transcription factor Pointed. The copia retrotransposon creates a phenotype of these structures that is further enhanced by the E(wa) (“E-wa”) gene. Calvin Bridges showed that a mutation in which the anterior portions of these structures fail to develop, called “bar,” is further accentuated (10[1])by a gene duplication creating the “ultra-bar” phenotype. (-5[1])One portion of these structures differentiates when the BOSS protein interacts with a receptor (10[1])tyrosine kinase called Sevenless to create (10[1])the R7 (10[2])cell. (10[1]-5[1])An unusually-inherited mutation that turns these structures white (10[2])in males (10[2])was studied by (10[1])Thomas Hunt (10[1]-5[1])Morgan (10[3])to discover (10[1])X-linked (10[1])inheritance. (10[1])For 10 points, (10[1])name these Drosophila organs (10[1])composed (10[1])of many ommatidia. (10[1])■END■ (10[2])

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