Evolution Change Over Time

1. EvolutionChange Over Time Kay Campany

2. Biology SCOS 3.05: Examine the development of the theory of evolution by natural selection including: 1. Development of the theory. 2. The origin and history of life. 3. Fossil and biochemical evidence 4. Mechanisms of evolution. 5.Applications.

3. 1. Development of the theory. Charles Darwin (1809-1882) You tube video of Darwin’s Theory The Complete Work of Charles Darwin On-Line

4. 2. The origin and history of life. • Origin of Life What is the Problem • Oparin’s Hypothesis • Miller/Urey Experiment • Origin of Life: Presentation • Edublog responses to the origin and history of life

5. 3. Fossil and biochemical evidence

6. 3. Fossil and Biochemical Evidence

7. 3. Fossil and Biochemical Evidence • Evidence from living organisms • Biochemical Evidence

8. 3. Fossil and biochemical evidence Is it a bird?

9. 4. Mechanisms of evolution. • Mechanisms of evolution • Blogspot for mechanisms of evolution • Directional Selection • Stabilizing Selection • Disruptive Selective

10. Directional Selection • Evidence of Natural Selection • Let's look at an example to help make natural selection clear. • Industrial melanism is a phenomenon that affected over 70 species of moths in England. It has been best studied in the peppered moth, Biston betularia. Prior to 1800, the typical moth of the species had a light pattern (see Figure 2). Dark colored or melanic moths were rare and were therefore collectors' items. • Figure 2. Image of Peppered Moth • During the Industrial Revolution, soot and other industrial wastes darkened tree trunks and killed off lichens. The light-colored morph of the moth became rare and the dark morph became abundant. In 1819, the first melanic morph was seen; by 1886, it was far more common -- illustrating rapid evolutionary change.  • Eventually light morphs were common in only a few locales, far from industrial areas. The cause of this change was thought to be selective predation by birds, which favored camouflage coloration in the moth. • In the 1950's, the biologist Kettlewell did release-recapture experiments using both morphs. A brief summary of his results are shown below. By observing bird predation from blinds, he could confirm that conspicuousness of moth greatly influenced the chance it would be eaten.

11. Directional Selection

12. Stabilizing Selection

13. Disruptive Selection Disruptive selection

14. Sources • http://www.youtube.com/watch?v=CKDSiNf_rLo • http://www.simsoup.info/Origin_Landmarks.html • http://www.simsoup.info/Origin_Landmarks_Miller_Urey.html • http://www.simsoup.info/Origin_Publications.html • http://www.answersingenesis.org/assets/images/articles/ee/v2/camel-evolution.jpg • http://evidence6.beyondgenes.com/images320/fossilk17.JPG • http://www.globalchange.umich.edu/globalchange1/current/lectures/selection/selection.html

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