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3 - 1 Introduction to Evolution Chapter 22 Descent with...

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1 Introduction to Evolution Chapter 22- Descent with Modification Read the entire chapter, you will also find the interview on p436-437 useful Work problems:1-3, 6, 8 Study Guide You should know Uniformitarianism: what it means and who developed this theory Gradualism: what it means and who developed this theory How both ideas relate to evolution by natural selection Who is Thomas Mathus, and how are is ideas related to evolution by natural selection? Who is Charles Darwin? Who is Alfred Wallace? What were the main points of On the Origin of Speices? Fig. 16.7a DNA carries hereditary information Evolution: Descent (heredity) with modification A new era of biology began on November 24, 1859, the day Charles Darwin published “On the Origin of Species by Means of Natural Selection” Darwin made two major points in his book: Evolution explains life’s unity and diversity Natural selection is a mechanism for the evolutionary process Fig. 22.3 By the 1700s biologists knew about fossils and understood that they are the remains of organisms from the past The study of fossils helped to lay the groundwork for Darwin’s ideas Species appeared and disappeared from the fossil record, how did species originate? Study of fossils also led to an appreciation of Gradualism and the age of the earth Gradualism Profound change can take place through the cumulative effect of slow but continuous processes
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