EVOLUTION
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Transcript of EVOLUTION
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OR HOW DID YOU ARRIVE TO THIS PLANET?
EVOLUTION
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THE ORIGIN OF LIFE
Atmosphere: inorganic molecules: CH4; NH3, H2O vapour, CO2, etc
+Energy of the sun and the storms =Organic moleculesCondensation produced liquid water =
oceansOceans + biomolecules = complex
biomoleculesThe first autoreplicative molecule was RNA!
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CURRENTS OF THINKING
Creationsim: this current bases its ideas in the Holy Bible; it says that the Creator made the organisms at once and there haven’t been changes in them.
Evolutionism: it admits changes in organisms in time.
Darwinism:Variation + adaptation = natural selection
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REASONS FOR EVOLUTION
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Mechanism of evolution: SPECIATION
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Darwin’s Filches (pinzones)
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TIMELINE
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EVOLUTION THEORIES
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Lamarckism
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Lamarck versus Darwin
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EVIDENCES OF EVOLUTION
Geographical evidencesZoologicalEmbryologicalGeologicalBiological
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Adaptation: Homologous organs
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Embryology
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New Theories
Darwinism + genetics (mutations and recombination) + biochemistry + population genetics + new discoveries = Neodarwinism or the Modern Synthesis
Morgan, Haldane, Dobzhansky
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Origin of life
Symbiotic origin of eukaryotic cells (Endosymbiotic Theory): (Lynn Margulis and Dorian Sagan)
The endosymbiotic theory states that several key organelles of eukaryotes originated as symbioses between separate single-celled organisms. According to this theory, mitochondria and plastids (e.g. chloroplasts), and possibly other organelles, represent formerly free-living bacteria that were taken inside another cell as an endosymbiont. Molecular and biochemical evidence suggest that the mitochondrion developed from proteobacteria and the chloroplast from cyanobacteria-
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Endosymbiotic theory
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Comparison Cyanobacterium- Chloroplast
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Comparing theories
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HUMAN EVOLUTION
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THE EARTH’S TIMELINE
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