Evolution Change Over Time

EvolutionChange Over Time
Kay Campany

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.

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

Origin of Life What is the ProblemOparins HypothesisMiller/Urey ExperimentOrigin of Life: Presentation

Edublog responses to the origin and history of life

2. The origin and history of life.

3. Fossil and biochemical evidence

3. Fossil and Biochemical Evidence

3. Fossil and Biochemical Evidence
Evidence from living organismsBiochemical Evidence

3. Fossil and biochemical evidence
Is it a bird?

Mechanisms of evolutionBlogspot for mechanisms of evolutionDirectional SelectionStabilizing SelectionDisruptive Selective
4. Mechanisms of evolution.

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.

Directional Selection

Stabilizing Selection

Disruptive Selection
Disruptive selection

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

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