Lect02S2011 - Biodiversity Things to know: Things What...

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Things to know: Things to know: What “kingdom” (clade)? Characteristics? Biodiversity Biodiversity What phylum? Characteristics? Representative given? Life cycle of representative.
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Biodiversity, in 8 th Edition of Campbell Biodiversity, in 8 th Edition of Campbell
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Biodiversity, in 8 th Edition of Campbell Biodiversity, in 8 th Edition of Campbell
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Characteristics: Characteristics: Unicellular, with cilia cilia used for locomotion and feeding Ciliophora (Ciliates) Ciliophora (Ciliates) Cilia = flagella, only shorter. Two types of nuclei: Macronucleus and several micronuclei Macronucleus: Growth, cell maintenance, asexual reproduction, etc. Micronucleus: Sexual reproduction
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Ciliophora (Ciliates) Ciliophora (Ciliates) Paramecium life cycle
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Asexual Reproduction Asexual Reproduction Single cell with one 2n macronucleus and eight 2n micronuclei (right) Macronucleus disintegrates Four micronuclei develop into macronuclei (purple) Four cell divisions occur without mitosis. One showing (left cell)
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Sexual Reproduction Sexual Reproduction Two compatible cells (note different micronuclei) line up and fuse Meiosis of micronuclei occurs in both cells
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Sexual Reproduction Sexual Reproduction Four 1n micronuclei produced in each cell Remaining nucleus divides by mitosis Three of four disintegrates
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Sexual Reproduction Sexual Reproduction Exchange of nuclei occurs Syngamy (=fertilization) forms one 2n micronucleus in each cell Micronuclei genetically different from parents
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Biodiversity, in 8 th Edition of Campbell Biodiversity, in 8 th Edition of Campbell
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Characteristics Euglenozoans Euglenozoans Photosynthetic, heterotrophic or both, i.e. mixotrophic Photosynthetic species with chlorophyll a and b. Cell wall absent! Formerly classified as alga and protozoan. Prime example of short-coming of 2-kingdom system.
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Characteristics Euglenids Euglenids Photosynthetic species that lose chloroplast or placed in dark can become heterotrophic. Absorb organic molecule. Heterotrophic species absorb organic molecules or engulf prey by phagocytosis phagocytosis
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Euglenids Euglenids Chloroplast Pellicle Paramylon Body Flagellum Contractile vacuoles
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Unicellular with one large mitochondrion Kinetoplastids Kinetoplastids Mitochondrion associated with kinetoplast kinetoplast containing lots copies of mitochondrial DNA. Species may be symbiotic or
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This note was uploaded on 08/09/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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Lect02S2011 - Biodiversity Things to know: Things What...

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