Biology 1002B Lecture Notes - Lecture 25: Trichromacy, Schiff Base, Rhodopsin

• School: Western University
• Department: Biology
• Course: Biology 1002B
• Professor: Tom Haffie

Document Summary

Lecture 25: every animal has eyes evidence of homology, the lens of the eyes are built from a group of proteins called crystallins are homologous to heat shot proteins that are chaperons (keeping things from denaturing). This could have happened by duplication of ancestral heat shot genes: all eyes have opsin, pax6 is a transcription factor which global embryonic regulatory transcription (essential). Play an important role in activating the development pathway that leads to the development of eyes. It evolved very early in evolution of animals evidence of homology: at least 40 types of eyes evolved independently, due to natural selection. The structure, tissues of all these eyes are different: there are 3 types of cone cells. The opsin (protein) is different: how could the change in position 113 influence the binding of retinal at position 296, the schiff base linkage at 296 can be protonated (more h+) or unprotinated (less h+).