Evolution endosymbiotic events

Hjy Chloroplasts contain their own DNA and the machinery for replicat-I ing and expressing it. However, chloroplasts are not autonomous they also contain many proteins encoded by nuclear DNA. How did the intriguing relation between the cell and its chloroplasts develop We now believe that, in a manner analogous to the evolution of mitochondria (p. 504), chloroplasts are the result of endosymbiotic events in which a photosynthetic... 

The transition from prokaryotic to eukaryotic cells and the subsequent events that took place during the origin of the eukaryotic cell remain some of the greatest unresolved, and hotly debated, biological puzzles. One of the few widely accepted facts of early eukaryotic evolution is that eukaryotic cells are fundamentally chimaeric organelles such as mitochondria and chloroplasts are derived from endosymbiotic precursors that are... 

These observations suggest a lateral transfer of cellulose synthase from cyanobacteria to D. discoideum. However, while the primary and secondary endo-symbiotic events that led to the evolution of plastids in plants and algae provide a clear mechanism for the transfer of a cyanobacterial cellulose synthase to photosynthetic organisms, such a mechanism is lacking for D. discoideum. Cyanobacterial genes are known to exist in eukaryotes which have secondarily lost plastids. However, there is no evidence for the existence of an endosymbiotic relationship between ancestors of D. discoideum and a cyanobacterium. Therefore, if a lateral transfer occurred, it was likely xenologous, possibly via a food ratchet mechanism (Doolittle 1998). 

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