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  1. 1. Natural and Artificial Selection James McCarthy
  2. 2. <ul><li>Natural selection is the process by which traits that help and organism to survive are passed down to future generations to better the survival of the species over time. </li></ul>Natural Selection
  3. 3. How Natural Selection works <ul><li>Variation in traits and overproduction </li></ul><ul><li>There is a differential survival reproduction/survival (fitness) </li></ul><ul><li>There is heredity </li></ul><ul><li>Over time this causes evolution and adaptation (Berkeley) </li></ul>
  4. 4. Variation in traits and overproduction <ul><li>Overproduction is when a species produces more offspring than resources will allow to survive. (Learner.) </li></ul><ul><li>All of these offspring have different traits. </li></ul><ul><li>These offspring are forced to compete with one another for limited resources. </li></ul>
  5. 5. Differential Reproduction/Fitness <ul><li>Selective pressures include predators, food, and antibiotics (drugs and toxins). </li></ul><ul><li>Organisms also compete over mates. The fitter (sexier) individuals have an easier time finding a mate and therefore produce more offspring. (Berkeley) </li></ul><ul><li>Fitter individuals also survive longer to produce more offspring than those with shorter life-spans. </li></ul>
  6. 6. Heredity <ul><li>Because there are more fit individuals reproducing than unfit individuals, the next generation of the species will carry more beneficial traits then the one before it. </li></ul><ul><li>This process continues over time… </li></ul>
  7. 7. Evolution and Adaptation <ul><li>Until after many generations the species as a whole has been altered!!! Evolution has occurred! </li></ul>
  8. 8. Origins <ul><li>Charles Darwin is the father of evolution and natural selection. </li></ul><ul><li>In 1859, Darwin publicized his theories of evolution and adaptation. (Lucidcafe) </li></ul><ul><li>He also introduced the concept of artificial selection. (Thinkquest) </li></ul>
  9. 9. Artificial Selection <ul><li>Artificial selection is all around us! </li></ul><ul><li>Humans domesticate many species so that dominant or favorable traits are passed on. </li></ul><ul><li>Cultures have used artificial selection for harvesting crops for centuries. </li></ul><ul><li>However, artificial selection has become very popular in recent years due to advances in technology and drugs. (Berkeley) </li></ul>
  10. 10. Natural Selection in a nutshell!
  11. 11. Works Cited <ul><li>&quot;Artificial Selection.&quot; Oracle ThinkQuest Library. ThinkQuest. Web. 25 Sept. 2009. <>. </li></ul><ul><li>&quot;Natural selection.&quot; Understanding Evolution. UC Berkeley. Web. 24 Sept. 2009. <>. </li></ul><ul><li>&quot;Life Science | Session 5.&quot; Teacher Professional Development and Teacher Resources by Annenberg Media. Web. 25 Sept. 2009. <>. </li></ul><ul><li>&quot;Lines of Evidence: Artificial Selection.&quot; Understanding Evolution. Web. 25 Sept. 2009. <>. </li></ul><ul><li>&quot;Charles Darwin | Naturalist.&quot; Lucidcafé Interactive Café and Information Resource. Web. 25 Sept. 2009. <>. </li></ul>