Biology 1002B Lecture 25: LEC25-ColourVision
28 Nov 2015
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Different because different tissues are recruited to make the eye. The way the eye works is different in different organisms. Independent development ~ 40 times: so useful, so many organisms develop eyes. Can"t just say it is through convergence. Pax6 is a transcription factor fundamentally required for brain and eye development in all animals. If you knock out pax6, you don"t develop eyes. Anything that has an eye has pax6. Lots of different forms of pax6, but they all share highly conserved domains. All eyes are type 2 opsins, all g protein couple receptors. Cone cells allow you to see colour. A cone cell is a eukaryotic cell. 3 major types of rhodopsin: sw, mw, lw, differ regard to wavelength sensitivity, short wave length rhodopsin retinal is excited by short wavelengths, medium wave length overlapping spectrum, long wave length rhodopsin.
