Wk 6 Lec 1

Wk 6 Lec 1 - Chapter13 HowPopulationsEvolve

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Chapter 13 How Populations Evolve
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Charles Darwin and The Origin of Species Charles Darwin’s  On the Origin of Species by Means of Natural Selection   was published  on November 24, 1859. Darwin argued that contemporary species arose from ancestors through a process of  descent with modification ,” with  natural selection  as the mechanism. The basic idea of natural selection is that Organisms can  change  over generations. Individuals with certain  heritable  traits leave more offspring than others.
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Charles Darwin and The Origin of Species The result of natural selection is evolutionary adaptation.
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Charles Darwin and The Origin of Species The Darwinian revolution in its historical  context Darwin’s Cultural and Scientific Context The Origin of Species Challenged the notion that the Earth was  relatively young and  populated by unrelated  species . The Greek philosopher  Aristotle  held the belief  that species are fixed and do not evolve.
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Lamarck and Evolutionary Adaptations In the mid-1700s, the study of  fossils  began to take form as a branch  of science. Naturalist Georges Buffon suggested that the Earth might be older  than 6,000 years. Observed similarities between  fossils and living species.
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The Voyage of the Beagle In December 1831, Darwin left Great Britain on the  HMS Beagle  to  explore the world.
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The Voyage of the Beagle On his journey on the Beagle,  Darwin collected thousands of  specimens. Observed various  adaptations in  organisms. Darwin was intrigued by The geographic distribution of  organisms on the  Galápagos  Islands. The fact that  Galápagos  organisms  resembled those in  South America.
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The New Geology Darwin was strongly influenced by the writings of  geologist  Charles Lyell . Darwin would apply Lyell’s principle of gradualism to the evolution of Earth’s life .
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Darwin made two main points in The Origin of Species: Organisms inhabiting Earth today  descended from  ancestral species. Natural selection
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This note was uploaded on 09/23/2011 for the course BIO 141 taught by Professor Brown during the Fall '08 term at Drexel.

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Wk 6 Lec 1 - Chapter13 HowPopulationsEvolve

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