Ch 19-23 SG - Sasha Preston Period 4 Chapter 19-23 Study Guide Chapter 19 1 Lamark Thought that species could evolve through disuse of body parts Lyell

Ch 19-23 SG - Sasha Preston Period 4 Chapter 19-23 Study...

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Sasha Preston Period 4 Chapter 19-23 Study Guide Chapter 19 1.) Lamark: Thought that species could evolve through disuse of body parts Lyell and Hutton: Geologists who perceived that changes in Earth’s surface take long periods of time. Wallace: Independently conceived the theory of evolution through natural selection 2.) Artificial involves humans breeding for desired traits, while natural occurs when individuals with advantageous traits survive and reproduce, passing on the trait. 3.) Variation allows the possibility for certain members of a population to have certain genes which would allow them to survive certain situations that would be harmful for other members of its species. These survivors then reproduce and pass on these traits. 4.) During a change to a species’ environment for example, certain individuals may have traits which better suit them to be able to thrive in this new environment. As these individuals survive and reproduce, this trait is passed on and becomes more prominent in the population over time. 5.) Homologous: Similar structures based on common ancestry Analogous: Similar structures between organisms based on convergent evolution rather than common ancestry. 6.) Biogeography- Shows how geographic barriers can lead to speciation. Comparative Morphology- Shows how all organisms can be traced back to one ancestor based on structural similarities.
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  • Fall '17
  • Randy Smith
  • Evolution, Sasha Preston

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