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Chpt. 15.1

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Chpt. 15.1

  1. 1. Chpt. 15.1- Darwin’s Theory of Evolution by Natural Selection Pgs. 418-422
  2. 2. Charles Darwin <ul><li>Charles Darwin had a degree in theology from Christ’s College (also studied medicine and science) </li></ul><ul><li>1831 Darwin boarded the HMS </li></ul><ul><li>Beagle. The mission was to </li></ul><ul><li>survey the coast of South America. </li></ul><ul><li>Darwin’s role was a naturalist </li></ul><ul><li>(collect biological and geological </li></ul><ul><li>specimens) </li></ul>
  3. 3. Galapagos Islands <ul><li>Darwin arrived at the Galapagos Islands in 1835. </li></ul><ul><li>Collected birds and other animals on the 4 islands. He noticed that different islands had their own slightly different varieties of animals. </li></ul>
  4. 4. <ul><li>Years later, Darwin determined that the finches didn’t live anywhere else. He suspected that populations of the birds from the mainland changed after reaching the Galapagos. </li></ul><ul><li>Darwin thought that perhaps artificial selection (process of breeding to produce desired traits in offspring) could work in nature. </li></ul>
  5. 5. Natural Selection <ul><li>Natural selection- The process whereby organisms better adapted to their environment tend to survive and produce more offspring. If you don’t adapt, you’ll die. </li></ul><ul><li>4 Principles to Darwin’s theory of evolution by natural selection. </li></ul><ul><li>1. Variation </li></ul><ul><li>2. Heredity </li></ul><ul><li>3. Overproduction </li></ul><ul><li>4. Reproductive Advantage </li></ul>
  6. 6. <ul><li>Variation - Individuals in a population differ from one another. Ex: Humans look different </li></ul><ul><li>Heredity - Variations are inherited from parent to offspring.Ex:Similar to your parents </li></ul><ul><li>Overproduction - Populations produce more offspring than can survive. </li></ul><ul><li>Reproductive Advantage- Variations that increase reproductive success will be more common in the next generation. </li></ul>
  7. 7. Origin of Species <ul><li>In 1859, Darwin published On the Origin of Species by Means of Natural Selection . </li></ul><ul><li>Used the term evolution only on the last page. </li></ul><ul><li>Evolution - Cumulative changes in groups of organisms through time. </li></ul><ul><li>Natural Selection is the mechanism evolution can occur. </li></ul>