OR HOW DID YOU ARRIVE TO THIS PLANET?

EVOLUTION

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!

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

REASONS FOR EVOLUTION

Mechanism of evolution: SPECIATION

Darwin’s Filches (pinzones)

TIMELINE

EVOLUTION THEORIES

Lamarckism

Lamarck versus Darwin

EVIDENCES OF EVOLUTION

Geographical evidencesZoologicalEmbryologicalGeologicalBiological

Adaptation: Homologous organs

Embryology

New Theories

Darwinism + genetics (mutations and recombination) + biochemistry + population genetics + new discoveries = Neodarwinism or the Modern Synthesis

Morgan, Haldane, Dobzhansky

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-

Endosymbiotic theory

Comparison Cyanobacterium- Chloroplast

Comparing theories

HUMAN EVOLUTION

THE EARTH’S TIMELINE