Packet 6: Tossup 10

Pax6 regulates the development of one component (-5[1])of this organ (15[2])across multiple (15[2]-5[1])species. (15[3])Crystallins make up one part of these organs (15[1])in vertebrates. (15[2])A theory of the Cambrian Explosion (15[1])posits that the evolution of these organs (15[1])started (15[1])an “arms (-5[1])race.” (15[1])These organs are (15[1])filled (15[1])with aqueous humor, (15[4])which is (15[1])secreted (15[5])from (15[2])the (15[1])ciliary (15[1])body. (15[2]-5[1])Large examples of these organs in (*) giant squids (10[1])are (10[1])focused through (10[1])movement, (10[2])rather than changing (-5[1])shape. (10[2])Thomas Hunt Morgan compared white and red (10[1])examples of these organs in Drosophila. (10[1])For 10 points, name these sensory organs that allow the perception (10[1])of visual information. ■END■ (10[2])

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