Ch 24 notes - Chapter 24 Evolution by Natural Selection...

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Chapter 24 Evolution by Natural Selection 1859- Darwin’s On the Origin of Species by Means of Natural Selection Evolution by Natural Selection - species change throughout time- not independent, related versus special creation - species were immutable Greek philosopher Plato – every organism was an example of a perfect essence or type created by God and slightly deviate from perfect type (“shadows”)- but should ignore Aristotle- great chain of being a.k.a. scale of nature or the ladder of life – species organized into sequence based on increased size and complexity (humans at top) Typological thinking - species are unchanging types and variations within species are unimportant or even misleading (e.g. Bible’s book of Genesis -> 1700s Linneaus’s classification in hierarchy kingdom, class. ..) 1809- biologist Jean-Baptiste de Lamark- species are not static but change through time, first to propose theory of evolution – based on chain of being- producing larger and more complex, or “better” species, inheritance of acquired characters, individuals change as develop in response to challenges posed by environment (e.g. giraffes develop long necks as they stretch to reach leaves high in treetops and produce offspring with elongated necks) Darwin claimed variation among individuals in a population was key to understanding nature of species – decent
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This note was uploaded on 10/25/2009 for the course LIFESCI Life scien taught by Professor Lorenz,t.c. during the Fall '09 term at UCLA.

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Ch 24 notes - Chapter 24 Evolution by Natural Selection...

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