slatkin3NoAnswers - Bio 1B, Spring, 2007, Evolution section...

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Bio 1B, Spring, 2007, Evolution section 1 of 4 Updated 2/27/07 12:42 PM Lecture 3 3 Mendel, Hardy, and Weinberg Reading: 7th edition 454-458; 6 th edition 446-449 Response to the Origin Wide acceptance of the fact of evolution The publication of the Origin led to a scientific revolution. Most scientists quickly accepted Darwin’s claim that evolution had occurred. Disagreements about the pattern and mechanism There was and still is disagreement about the pattern and mechanism proposed by Darwin. Many of Darwin’s supporters did not agree with the gradual pattern. They thought that discontinuous changes also occurred. They argued that the absence of intermediate forms does not prove that they existed. If change had been discontinuous it was not necessary to explain what advantages intermediate forms had. Some supporters of Darwin’s theory thought that natural selection was not sufficient to cause all of evolution. Everyone agreed that that natural selection could cause changes in the way described in the Origin . The question was whether it was sufficient to have caused all changes in the history of life or whether additional mechanisms were needed. Mendel plus Darwin Darwin did not have a convincing explanation for inheritance The theory of natural selection was criticized because Darwin could not explain why differences among individuals persisted and how those differences are inherited. It appeared that natural selection would eliminate variation within species. In later editions of the Origin , Darwin changed his discussion of inheritance, but he never effectively resolved this problem. Mendelian inheritance was rediscovered in 1900. Mendel, in 1865, discovered what is now called Mendelian inheritance by studying characters in the common garden pea. His work was ignored at the time, but his achievements were later recognized when the same rules were rediscovered in 1900 and soon found to apply to a wide variety of plant and animal species, including humans. By the 1920s, there was general agreement that all of biological inheritance was
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This note was uploaded on 09/02/2008 for the course BIO 1B taught by Professor Carlson,mischel,power during the Spring '07 term at University of California, Berkeley.

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slatkin3NoAnswers - Bio 1B, Spring, 2007, Evolution section...

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