Lec15_Algae_handout - BioG1780 Evolution and Biodiversity...

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BioG1780 Fall 2010 Evolution and Biodiversity Today’s lecturer: Harry Greene Lectures 15: September 29, 2010 1. Light on water and the origin of plants. With this and remaining biodiversity lectures we explore the remarkable adaptive radiation of multicellular life on earth. Recall that (1) among “prokaryotes” there were examples of colonial bacteria, unicellular or exhibiting at most simple differentiation among cells in terms of form and function (can you think of an example among cyanobacteria?), and (2) among the five major lineages of eukaryotes, true multicellularity is widespread and independently evolved (remember kelp, a brown algal chromalveolate?). In today’s lecture and that of October 6 th I’ll cover the extraordinary diversity of Plantae; we have a special guest lecture to cover fungi on October 4 th . In terms of today, first review pp. 574 and 579-580 in Sadava et al. regarding basal lineages of Plantae, then read Ch. 28 on the rise of land plants. 2. What are glaucophytes? As is the case for fungi and animals, the basal-most lineages of Plantae are relatively simple and retain shared primitive features (NB: what is the technical general term for such attributes?) with more basal eukaryotes. Thus glaucophytes, like more complex Plantae, have two
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Lec15_Algae_handout - BioG1780 Evolution and Biodiversity...

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