Round 6: Tossup 10

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

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