1. Darwin and the Development of a Theory Leading up to the Voyage of the H.M.S. Beagle © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

2. Who Was Charles Darwin? View the following video clip to get an overview of who Darwin was and his ideas about evolution: http://www.teachersdomain.org/resource/tdc02.sci.life.evo.dar/ © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

3. Historical time leading up to Darwin’s life and work 1798 Economist Thomas Malthus suggested that: Population growth, including human population growth, will always exceed the amount of food available to feed the population. The geometric growth of the human population would lead to starvation and suffering by the poorer members of society. There would be competition for food. Those successful in competing would survive, while those who failed were doomed to starvation.

4. 1809 Darwin was born. French naturalist Jean Baptise Lamarck published Zoological Philosophy: Proposed a mechanism for evolution based on use and disuse of organs. Lamarck ’ s work was one of the first theories of evolution. © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

5. An example of Lamarck’s mechanism for evolution This is an adult giraffe. The giraffe reaches for leaves slightly out of reach. The use of the neck causes it to lengthen slightly. The offspring of the giraffe also has a longer neck. © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

6. Today, Lamarck’s theory is not supported by evidence and has been rejected. © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

7. 1825 Darwin ’ s father takes him out of school for his poor grades and lack of direction. Thinking Charles might end up being a disgrace to himself and his family, his father decided that he should pursue a medical career along with his brother. That summer Darwin worked as an assistant in his father ’ s medical practice. © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

8. 1827 After realizing he did not enjoy studying medicine, Darwin dropped out of medical school and began preparing for a career in the clergy at Cambridge. © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

9. 1830 Charles Lyell published the first volume of Principles of Geology: Discusses evidence for the great age of the Earth. Proposed that small changes built up over long periods of time lead to change on a grand scale. © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

10. 1831 Darwin passed the final exam for the clergy. Darwin received a letter from a professor and tutor at Cambridge inviting him on the voyage of the H.M.S. Beagle for its survey of South America and other locations around the world. Darwin ’ s father did not approve, but eventually allowed him to go. © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.

11. Now you will read more about Darwin’s development of the theory of natural selection. © 2008 Regents of the University of California. All rights reserved. Use for SGI Field Test only.