Biology 2581B Lecture Notes - Lecture 4: Symbiogenesis, Intracellular Parasite, Red Algae
11 Feb 2017
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Document Summary
Blend two things together and get a genetic merger. Eukaryotic domain developed from endosymbiosis between alpha-proteobacterium and loki. Over time a cyanobacterium comes in because a eukaryote engulfed it and integrated it into its cell. Cyanobacterium is engulfed and integrated into lineage. Lineage evolves and it eventually diverges giving rise to major grooves. Chloroplast all trace back to this event and they inherited their chloroplast from ancestor that passed it to them vertically through time. Chloroplasts can pass down laterally (horizontally) across the tree in addition to vertical transmission. Horizontal transfer of chloroplasts across the eukaryotic tree. Have a eukaryote that already has a chloroplast (came from genetic integration of cyanobacterium) unicellular, they are still predators: eat algae and turn it into food. Eukaryotes make a living by eating photosynthetic eukaryotes even though they are. Another eukaryote (non photosynthetic no chloroplast) eats one of these cells: can get a genetic merger when you eat something very rare!
