Nothing in biology makes sense except in the light of evolution. Theodosius Dobzhanksy.

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Presentation transcript:

Nothing in biology makes sense except in the light of evolution. Theodosius Dobzhanksy

What is a theory? zA theory is a broad, overarching explanation to explain a natural phenomenon yLittle doubt that it is true yGenerally incorporates a pattern and a process

Evolution - theory that zAll organisms are related to each other by common ancestry (pattern) zAll organisms have changed over time primarily in response to natural selection (process)

Landmarks in Evolutionary Biology

Aristotle 340 B.C. Invents scientific natural history while pursuing marine biology on the island of Lesbos

Carolus Linnaeus Founds field of taxonomy

Georges-Louis Leclerc, Comte de Buffon Catalogues all known life in his Historie naturelle

Georges Cuvier 1795 Founds comparative anatomy; classifies the invertebrates in more detail than Aristotle did

Jean Baptiste de Lamarck zArgues that a process of organismal evolution can cause differences observed between species but gets mechanism wrong (inheritance of acquired characteristics) zProduces an evolutionary tree of the animals as good as those produced a century later