13_Maloof_LifeCycles_Euks - i Initial evidence similarities...

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BIS2C W2011 Lecture 13 Maloof Jan 26, 2010 PERLIMINARY LECTURE OUTLINE--SUBJECT TO CHANGE 1) Eukaryotic sexual life cycles a) reminder: mitosis maintains chromosome number; meiosis reduces chromosome number. i) all eukaryotic sexual life-cycles have two essential components: (1) haplolid gametes fusing to create a diploid (2) meiosis reducing diploid cells to haploids b) "generic" = sporophytic. i) multicellular at both haploid and diploid stages ii) alternation of generations iii) Ulva or plants as an example c) diplontic i) multicellular diploid (humans as an example) d) haplontic i) multicellular haploid (Ulothrix as an example) 2) Quick review: eukaryotic cells 3) Mitochondria a) Function of mitochondria b) Almost all eukaryotes have a mitochondria c) Mitochondria arose by endosymbiosis of a bacteria
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Unformatted text preview: i) Initial evidence: similarities ii) a scenario for endosymbiosis iii) phylogenetic analysis iv) which bacteria? -- v) how many events? 4) Photosynthetic Eukaryotes a) Where are they on the tree of life? i) Did photosynthetic eukaryotes evolve more than once? b) How did eukaryotes aquire the ability to photosynthesize? i) acquisition of a chlorplast ii) what is a chloroplast? iii) what is the origin of chloroplasts? 5) Endosymbiosis and chloroplasts a) A scenario for endosymbiosis b) how many primary endosymbiotic events were there? i) chloroplasts form a monophyletic clade c) how can this be reconciled with multiple origins of photosynthetic eukaryotes? i) secondary and tertiary endosymbioses...
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This note was uploaded on 03/09/2011 for the course BIS 2 taught by Professor Coolprof during the Spring '11 term at Bank Street College of Education.

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