Biology 1002B Lecture Notes - Lecture 23: G Protein–Coupled Receptor, Cone Cell, Photoreceptor Cell
24 Sep 2017
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Lecture 23: evolution of eye and colour vision i: eyes have developed multiple times, ability to evolve eyes overtime is very important; gives you a selective advantage, allows you to see your food and predators. Eye ontogeny suggests convergence; ie. the developmental process that gets you the eye: what tissues must be recruited, genes must be expressed, pathways; how the eye is actually made. If you look at ontogeny, the eyes are very different ie. insect eye nothing like human eye: from a developmental point of view, not a lot of support for homology, 2. Photoreceptor cells: 2 types rod cells (see black and white and shapes) and cone cells (see colour: have 3 types of cone cells, each contain lots of copies of the same opsin, 3. Many different organisms have all developed the need to see developed eyes: but evolved these eyeball differently, evidence for homolgy, 1.
