Biology 2581B Lecture Notes - Lecture 4: Symbiogenesis, Red Algae, Horizontal Gene Transfer
11 Feb 2017
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Key point: blend two things together and get a genetic merger. Tree of life is a story of endosymbiosis and genetic mergers. Cyanobacterium arrives because it gets engulfed and integrated in the lineage: the lineage evolves through time and diverges and gives the major groups. The chloroplast in red algae, land plants, and green algae all trace back to this event and inherited their chloroplasts from this ancestor that passed it to them vertically through time. Horizontal transfer of chloroplasts across the eukaryotic tree. Another theory: chloroplast instead of being passed down vertically through time can get passed laterally across the tree. Eukaryote that already has a chloroplast: know where they came from from the genetic integration of cyanobacteria. Another eukaryote does not have chloroplast & is not photosynthetic. It eats one of these cells: lots of eukaryotes make their living by gobbling up photosynthetic eukaryotes even though they are unicellular they are good at being predators.
