03. Evolutionary mechanisms

03. Evolutionary mechanisms - 1 The cabbage group of...

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1/12/2009 1 1 The cabbage group of vegetables all evolved from one ancestor, with the help of humans This is artificial selection or human selection 2 Wild mustard – similar to the ancestor of broccoli, cabbage, etc. 3 Different breeds of dogs came about through artificial selection. What does this prove about the process of evolution? 4 Artificial selection • Plants produce a great many more seeds/offspring than are needed for next year’s crop • Seed are collected only from desirable variants in each generation each generation • Seed from undesirable individuals are destroyed, or not planted • Over many generations, selected varieties can become very different from their ancestor • Different varieties can come from the same common ancestor by selecting for different characteristics 5 So how does biological evolution work? • Charles Darwin dld t h t h f developed the theory of Natural Selection to explain the mechanism of evolution 6 What is natural selection
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This note was uploaded on 02/10/2010 for the course BSC 2010 taught by Professor Essig during the Spring '10 term at University of Southern Maine.

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03. Evolutionary mechanisms - 1 The cabbage group of...

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