Macro-/Microevolution

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Presentation transcript:

Macro-/Microevolution Macroevolution 1. Large-scale changes in gene frequencies 2. Longer time period 3. At/above level of species 4. Extended microevolution 5. Not directly observed 6. Fossil Evidence 7. More controversial 8. Eg reptiles  birds Microevolution 1. Small-scale changes in gene frequencies 2. Few generations 3. Within species / population 4. small evolutionary changes 5. Observable 6. Experimental evidence 7. Less controversial 8. Eg Bacterial resistance to antibiotics Macro-/Microevolution

Macro- / Microevolution

Microevolution – dog breeds Bred for certain traits Changes in size, shape, and color—or minor genetic alterations NOT macroevolution (adaptative) Microevolution – dog breeds http://www.creationscience.com/onlinebook/webpictures/dogs.jpg

Patterns of Macroevolution Species Unrelated Related Intense environmental pressure Inter-relationships Similar environments Small populations Different environments Convergent evolution Punctuated equilibrium Adaptive radiation Coevolution Extinction

These are theories/models of evolution A. Adaptive Radiation (divergence) B. Convergent Evolution C. Coevolution D. Gradualism E. Punctuated Equilibrium F. Mass Extinctions Patterns of Evolution

Patterns of Evolution