BIO130H1 Chapter Notes - Chapter 1: Lynn Margulis, Prokaryote, Archaea
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BIO130H1 Full Course Notes
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Document Summary
The fossil record documents when early eukaryotes lived and when key eukaryotic traits, first appeared. Additional insights into the origin of eukaryotes have come from. In particular, dna sequence data suggest that eukaryotes are molecular studies (cid:498)combination(cid:499) organisms, with some of their genes and cellular characteristics being derived from archaea, and others from bacteria. Until about 1970, it was generally believed that eukaryotic cells evolved from prokaryotic cells by a process of gradual evolution in which the organelles of the eukaryotic cell became progressively more complex. Lynn margulis, then at boston university proposed the. Endosymbiont theory: margulis resurrected an idea that certain organelles of a eukaryotic cell most notably the mitochondria and. Chloroplasts had evolved from smaller prokaryotic cells that had taken up residence in the cytoplasm of a larger host cell. The prokaryotic ancestors of mitochondria and plastids such as. Chloroplasts probably gained entry to the host cell as undigested prey or internal parasites.
