Lecture 10 CELL DIVISION

Lecture 10 CELL DIVISION - L ecture 10 CELL DIVISION ORIGIN...

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Lecture 10 CELL DIVISION ORIGIN OF THE EUKARYOTIC LINEAGE - evolutionary biologists are keenly interested in understanding major transitions in eukaryotic evolution o origin of the nucleus (eukaryotic cell) o originof the mitochondrion and chloroplast-the endosymbiotic theory o development of multicellularity Everything began from a simple, prokaryotic cell, - enclosed in a semi-permeable cell membrane - DNA- genetic material - RIBOSOMES ORIGIN OF THE NUCLEUS? - hypothesis 1: infolding of plasma membrane, mediated by the cytoskeleton, encloses DNA and forms the nucleus - hypothesis 2: a bacterial cell engulfed an archaeal cell which became an endosymbiont SYMBIOSIS – an ecological relationship with two or more species living closely together. - classes of symbiotic associations: o mutualism – both members benefit o commensalism – one benefits while neither harming nor helping the other o parasitism – one benefits at the expense of the other CHLOROPLASTS AND CYANOBACTERIA Choloroplasts and Mitochondria
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Lecture 10 CELL DIVISION - L ecture 10 CELL DIVISION ORIGIN...

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