1 - Bio 1B, Spring, 2008, Evolution section 1 of 3 Lecture...

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Bio 1B, Spring, 2008, Evolution section 1 of 3 Updated 2/28/08 10:11 AM Lecture 1 1 Darwin and The Origin of Species Reading: 7 th edition 438-446; 6 th edition 428-437. The Origin of Species is not required reading, but copies of the first and sixth editions are freely available from the Gutenberg Project, www.gutenberg.org. Logistics Office hours: Monday, Tuesday, Wednesday 9-10, 2013 VLSB or by appointment (slatkin@berkeley.edu) Responsible for material in the lectures and lecture notes If material is in the text but is not covered in the lectures and notes, it will not be on the exams. Updated versions of the notes will reflect what is presented in lectures. Examples from the labs and the lectures will be on the exams. Sample exam questions will be included with each set of notes. They are intended to show the types of questions asked on the midterm and final but not the whole range of topics that will be covered. The 2nd midterm, 6 PM on Friday, April 11, will be on all the material in the evolution section, including material presented on Wednesday, April 9. Any theory of evolution must have three parts. The fact of evolution: All living organisms are descended from other living organisms and ultimately from one or a few ancestors. Darwin called this idea “descent with modification.” The pattern of evolution: The pattern is what actually happened. Darwin said that the pattern was gradual and continuous, not discontinuous. The mechanism of evolution: Darwin argued that natural selection alone caused descent with modification. Uniformitarian assumption Darwin’s theory is based on what is now called the “uniformitarian assumption” or the assumption of “natural law.” The uniformitarian assumption is that the rules governing change were the same in the past as they are today. The name “uniformitarian” comes from the uniformitarian theory of geology, which argued that changes in the earth’s surface are the result of processes at work today. For example, sedimentary rocks were
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1 - Bio 1B, Spring, 2008, Evolution section 1 of 3 Lecture...

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