principles of evolution - western oregon universitywou.edu/~guralnl/101evolutioni.pdf · principles...

Principles of Evolution

• Early biological thought

• Genes within populations

• Hardy-Weinberg equilibrium

• Microevolution • Forms of Selection

Evolutionary thought• Pre-Darwin• Greek: created

simultaneously and unchanging

• Aristotle: ladder of nature• William Smith (1700s)

studied fossils• Fossils from organisms

that had gone extinct• Different organisms had

lived at different times.

Evolutionary thought• Cuvier: Catastrophism• Hutton and Lyell: natural

processes, uniforitarianism, slow, due to wind, water,earthquakes, and volcanos

• Lamarck: 1800s, inheritance of acquired characteristics

Descent with modification

Darwin and Wallace

• Mid 1800s• From Hutton and Lyell

age of earth is old• Proposed Natural

Selection

Natural Selection

Evidence for evolution

Embryological similarities Analogous structures

Modern Evidence

• Artificial selection• Pesticide resistance• Antibiotic resistance

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