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Lecture

Lecture 1 - Evolution.docx

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Department
Biology
Course
BIO2137
Professor
John Thor Arnason
Semester
Fall

Description
Lecture 1EvolutionSeptember10121057 AMSept 11 2012KEYWORDSPrecambrian and Cambrian evolution sequenceEvolutionDarwin Wallace Theory of Nature Selection microevolutionModern Ideas in Macroevolution extinction events punctuated equilibrium6th ExtinctionSpecies Concepts biological species concept phylogenetic species conceptProcesses of note in plant evolution allopatric isolation sympatric isolationPolyploidyHybridsApomixis St Johns wort cornCoevolutionConvergent evolutionSTRUCTURES Sequence PrecambrianCambrian Evolution46 billion birth of planet1Ideal elements of life werent availableLife couldnt exist35 billion first bacteria1Dont know if formed on earth spontaneously or from another planet and developed in good conditions28 billion oxygen revolution1Atmosphere changes from anoxic to aerobicEvolution of organisms and larger animals now possible available energyAdvanced photosynthesis gave oxygen makes plants a key player in world development0915 billion first eukaryotes1Enter more complex organisms with nuclear envelope around nucleus570 million Cambrian explosion1
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