PDF_notes_Mechs_1 - Announcements The D2L grade book has...

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1 Announcements •The D2L grade book has been corrected: lab is NOT part of this course. •Extra credit is offered for office visits to profs, to ask questions about course content. • One point extra credit per visit, up to a max of two points. •Remind us to record the point when you visit. Mechanisms of Evolution Part 1: Natural selection Thur 1/24/08 4 observations 1. Populations of living things change over time 2. Organisms are good at what they do 3. Organisms multiply in number 4. Offspring tend to resemble their parents 1. Evolution occurred • Evolution = change over time • We see in fossil record that evolution has happened • The only question is: How? • Darwin made an analogy with artificial selection, or breeding of plant end animal varieties. Artificial selection We breed dogs, pigeons and crops for things we like. Wild cabbage ( Brassica oleracea )
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2 From Brassica to vegetables 2. Organisms are good at what they do Strong, curved beak of bald eagle can tear flesh of large prey Curlew uses low, curved, pointed beak to get small crustaceans from the surface of mud, sand and soil Roseate spoonbill moves its bill through water to filter food out 2. Adaptation • = to become “apt” or to fit the environment well • Organisms are very good at what they do • How did this come about? • In nature, who (or what) selects the individuals to
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This note was uploaded on 01/31/2009 for the course BIO 182 taught by Professor Chaux during the Spring '08 term at University of Arizona- Tucson.

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PDF_notes_Mechs_1 - Announcements The D2L grade book has...

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