BIS 2C Lecture Notes - Lecture 14: Gamete, Mitosis, Phagocytosis
28 Feb 2018
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Document Summary
Planetary co2 levels are linked to seasonal variation in vegetation. The mass of the wood in this theater came from carbon dioxide in the air: all life on this planet is carbon based. Life evolved in water and eventually to land (especially the plant clade) Key concepts: primary endosymbiosis produced the first photosynthetic eukaryotes, acquisition of chloroplasts, key adaptations permitted plants to colonize land, vascular tissues led to rapid diversification of land plants. The plantae: polytomy occurring where the plantae clade branches off, plantae themselves are a monophyletic clade. Glaucophytes: retain peptidoglycan wall, phycobilins dominated by phycocyanins, blue-green chloroplasts, loss of peptidoglycan, loss of flagella only in the red algae. Red algae: no swimming stages in entire life cycle, phycobilins dominated by phycoerythrins, red in color, loss of phycobilins and evolution of chlorophyll b. Challenges to life on land: drying out, structural support, extreme environments, uv- and photo-damage, transport of water and nutrients, gamete dispersal.
