What evolution is….

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Presentation transcript:

What evolution is…

Lamarck Jean-Baptiste Pierre Antoine de Monet, Chevalier de Lamarck Published in 1809 “Evolution as Striving” http://evolution.berkeley.edu/evosite/history/evol_happens.shtml

Lamarck: Inheritance of acquired characters

Lamarck: Populations change as individuals change in response to environment

Lamarck: 1) no relationships among living taxa 2) species diversity explained by repeated spontaneous generation

Slow death of the idea of Spontaneous Generation—1668-1859

Natural Selection Lamarck: As individuals change in response to the environment, populations change over time Darwin: Differential reproductive success explains how populations change over time Natural Selection

Lamarckian evolution had some problems… What did he get right?

Charles Darwin 2 great contributions 1) evolution by means of natural selection (mechanism) 2) species are related (common ancestry) Born 1809 (year Lamarck published) Published “O of S” when 50 years old! (1859)

Darwin: Populations change as individuals experience different reproductive success (based on environment) Lamarck vs. Darwin: Differential reproductive success is the main difference

Evolution by Means of Natural Selection