L5 - Origin of Eukaryotes

L5 - Origin of Eukaryotes - OR Sexual Reproduction • Can...

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Origin of Eukaryotes: Protists Consumption to achieve energy Photosynthesis & absorption of molecules through environment Locomotion in Protists Amoeboid Motion: sliding motion; done by streaming of pseudopodia o Cell Crawling -> requires ATP; & interactions between ACTIN & MYOSIN in cytoplasm Made of Microtubules Float Reproduction Asexual Reproduction: based on mitosis in Eukaryotes; Binary Fission in Bacteria/Archaea o Offspring Genetically Identical Vulnerable to Environmental Pressures Sexual Reproduction: based on meiosis & fusion of Gametes o Offspring Genetically Unique NOTE: evolved in protists & ranks among the most significant innovations of Eukaryotes Sexual vs. Asexual Reproduction Sexual – Provides new combination of genes; & genotypes of parasites change quickly so environmental pressures are constantly changing, different genetic makeup leads to greater survival Protist Can Go either Asexual Reproduction
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Unformatted text preview: OR Sexual Reproduction • Can be dominated by Diploid OR Haploid Cells Variation in Cycles Compare Prokaryotes with Protists Life Cycle: sequence of events that occurs in individual growth, maturity & reproduce Alternation of Generation: One phase of Life Cycle based on Haploid, another based on Diploid Form Gametophyte: Haploid form; specialized cells produce Gamete through Mitosis Sporophyte: Diploid form; specialized cells undergo Meiosis, producing haploid cells called SPORES Protists: Summary • Paraphyletic Group Morphological Innovation o Creation of a Nucleus o Development of Chloroplast o Multi-cellular o Evolution of Reproduction o Support & Protection (Silicon Shell) o Increase in Size • Includes ALL Eukaryotes Except: Green Plants, Fungi & ANIMAL • Reproduction: o Sexual Reproduction; Alternation of Generations • Obtain Food: o Photosyntheic :chloroplast; protest engulfed cyanobacteria (ingest, absorb, etc)...
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This note was uploaded on 04/12/2011 for the course BIO 153 taught by Professor Dr.arts during the Winter '11 term at University of Toronto- Toronto.

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L5 - Origin of Eukaryotes - OR Sexual Reproduction • Can...

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