Evolution change in a gene pool over time (many generations) Monday, February 9, 15
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Evolutionchange in a gene pool over time
(many generations)
Monday, February 9, 15
Evidence for evolution
• biogeography
• fossil record
• comparative anatomy
• homologous structures
• vestigial structures
• analogous structures
• comparative embryology
• similar biochemistry = DNA and protein
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Lamarck(1744-1829)
believed in “use & disuse” - if you needed a trait, you could develop
it in your lifetime
Also believed you would pass that trait on to
your offspring
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Charles Darwin
• 1809-1882
• Sailed around the world 1831-1836
• Researched Galapagos Islands
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On the Origin of speciesdarwin finally
published his ideas in 1859
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Natural Selectiondescent with modification
• More members are born into a population than will survive
• Not all members are the same (genetic diversity)
• Some members are better suited to environment
• Those better suited will survive and pass traits on to offspring
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traits that help an organism survive in that
environment were “selected”
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Stephen jay gould1941-2002
punctuated equilibrium
similar to Darwin except in timing
Believed population only changes when
environment causes a change
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