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Lecture 27

BIOL 1010 Lecture 27: Lecture 27

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University of Manitoba
Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

c82 Bio 1010 - mitochondria and chloroplasts even replicate their own DNA and reproduce by a process similar to that of prokaryotes scientists think that heterotrophic eukaryotes evolved first, which had mitochondira but no chloroplasts autotrophic eukaryotes are thought to have arisen later from a lineage of heterotophic eukaryotes descended from an individual that engulfed an autotrophic cyanobacterium through primary endosymbiosis - if the cyanobacterium continued to function within its host cell, its photosynthesis would have provided a steady source of food for the heterotrophic host and thus given it a significant selective advantage also because the cyanobacterium had its own DNA, it could reproduce to make multiple copies of itself within the host cell - cyanobacterium could also be passed on when the host reproduced over time the descendents of the original cyanobacterium evolved into chloroplasts - the chloroplast bearing lineage of eukaryotes later diversified into the autographs green algae and red algae on subsequent occasions during eukaryotic evolution green algae and red algae themselves became endosymbionts following ingestion by heterotrophic eukaryotes - heterotrophic host cells enclosed the algal cells in food vacuoles o but the algae or parts of them survived and became cellular organelles the presence of the endosymbionts which also had the ability to replicate themselves, gave their hosts a selective advantage this process called SECONDARY ENDOSYMBIOSIS is when autotrophic eukaryotic protist became endosymbiotic in a heterotrophic eukaryotic protist - this is a MAJOR KEY to protist diversity
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