Biology 1002B Lecture Notes - Lecture 25: Gene Duplication, Irreducible Complexity, Pax6
24 Sep 2016
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Document Summary
3 types od cone cells/rhodopsins = trichromatic vision. Retinal is the same in all 3 rhodopsins the pigment does not change. Retinal in each one just bends a little differently in each one, so it interacts with the pigment differently. Major similarity and differences as revealed in protein alignment of sw, mw and. There is lots of conservation between the 3 opsins with regard to amino acid sequence. Medium and long are highly conserved, divergent from short wavelength. There are subtle changes in retinal absorption changes in the folding o. Subtle changes in amino acid sequence changes the retinal absorption. Importance of lysine at position 296 and glutamic acid at position 113. When retinal (?) folds, the lysine and glutamic acid can interact. Assocatiation between trichromacy, dichromacy, old world monkeys and new world monkeys. Old world monkeys are trichromats, new world monkeys are dichromatic. Trichromatic vision is more likely to be selected for when food is distinguished from non-foods.
