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Ast1141Lec16NaturalSelection.pptx - Evolution and Natural...

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Evolution and Natural SelectionAstronomy 1141
Evolutionary Adaptation:Living organisms evolve to adapt to their environment.Pygmy seahorse(camouflaged in coral)Significant adaptations can result inthe emergence ofnew species.Adaptations accrue topopulations,not individuals, appearing over manysuccessive generations.
Anaximander (c. 610-547 BC)Life arose in water and developedinto more complex forms.Jean-Baptiste Lamarck (1744-1829)Traits acquired by an organism during itslifetime can be passed on to offspringWrongWrongThe idea of the evolutionary adaptation in life isancient.Aristotle (c. 384-322 BC)Species are fixed and unchanging.
Charles Darwin proposed thatNatural Selectionis theprimary mechanism of evolution in 1859.On The Origin of Species(London, 1859)Charles Darwin (1809-1882)HMS Beagle inTierra del Fuego
Contingent vs. Predictive PropertiesLife on Earth shares many fundamentalpropertiesIt is not clear that these particular solutionsmust beuniversalLife on Earth has also evolved andchanged during the history of the planetThemechanismfor these changes isactually fundamental, and likely to applyuniversally

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