Round 6: Tossup 10

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

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