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Unformatted text preview: Eukarya 26/02/2008 18:09:00 Differences • Evolution o Flexible cell surface o Cytoskeleton Internal structure Allows movement of ogranelles o Nuclear membrane Origins of Nucleus Also not present in prokaryotes o Digestive vesicles o Endosymbiotic acquisitions Endosymbiosis- One organism living inside another Organelles Most were once independent prokaryotes • Chloroplasts • Mitochondria Retain their own DNA 2 membranes • Eukaryotic ancestor o Outer membrane o Originally part of eukaryotic cell wall • Prokaryotic ancestor o Inner membrane Primary endosymbiosis Cell takes in a prokaryotic organism Secondary endosymbiosis Cell engulfs another cell which has already taken in components • Ancestral ‘host’ cell • Multiple membranes • Sexual life cycle o Meiosis Dipoid cells produce haploids Haploids recombine into new diploids o Recombination of homologous chromosomes New combinations of alleles Not always present in parent generation o Mitosis Makes copies of DNA Exact copies Clones o Forms of Sexual life cycles Diplontic Life cycle Multicellular organism is diploid Only haploid before fertilization • Created in meiosis...
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- Spring '08
- Bacteria, haploid Haploid, Endosymbiosis One, mutlicellular forms Haploid, haploid spores Alteration