Bis2C.Lecture12

Bis2C.Lecture12 - Eukaryotic Diversity II Bis 2C Lecture 12...

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Eukaryotic Diversity II Bis 2C Lecture 12 October 15, 2008
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Study Session Sunday Here 3-5 PM
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The Tree of Life
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• Everything other than plants, animals and fungi Referred to as protists Or microbial eukaryotes • Paraphyletic group
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Lots of Ambiguities in Resolving Early Events in Evolution
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• Many Aspects of Diversity: Locomotion Morphology Behavior Metabolism Cell surfaces Symbioses Reproduction Life history
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• Main focus in lectures: Symbioses Reproduction Life history
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Reproduction • Most microbial eukaryotes have both sexual and asexual reproduction • Asexual Binary fission —equal splitting; mitosis followed by cytokinesis. Multiple fission —splitting into more than two cells. Budding —outgrowth of a new cell from the surface of an old cell. Spores —specialized cells that are capable of growing into a new individual.
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Sexual reproduction • Conjugation Fusion of haploid nuclei • Alteration of generations A diploid spore-forming organism gives rise to a haploid gamete-forming organism When haploid gametes fuse a diploid individual is formed. Both stages multicellular and undergo mitosis
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Figure 27.14 Alternation of Generations
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• Alternatives to alternation of generation Diplontic: every cell but the gamete is diploid (e.g., animals) Haplontic: every cell but sporocyte is haploid
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27.17 Major Eukaryote Groups in an Evolutionary Context (Part 1)
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27.17 Major Eukaryote Groups in an Evolutionary Context (Part 2)
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27.5 What Are the Major Groups of Eukaryotes? The Plantae consist of several clades; all chloroplasts trace back to a single incidence of endosymbiosis.
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27.5 What Are the Major Groups of Eukaryotes? Glaucophytes are unicellular, freshwater organisms The chloroplast retains a bit of peptidoglycan between the inner and outer membrane.
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27.5 What Are the Major Groups of Eukaryotes? Most red algae are marine and multicellular. Red pigment is phycoerythrin . Also have phycocyanin, chlorophyll a, and carotenoids.
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Figure 27.25 Red Algae
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Motile spores released from the red alga Purpureofilum
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Bis2C.Lecture12 - Eukaryotic Diversity II Bis 2C Lecture 12...

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