BSC 1050 unit 2 notes, handout

BSC 1050 unit 2 notes, handout - BSC 1050 - Unit 2,...

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I. Biodiversity A. Examples of types of biodiversity: 1. Genetic diversity 2. Species diversity 3. Habitat (ecosystem) diversity B. Why is greater biodiversity better? 1. 2. 3. 4. C. Taxonomy 2. Why do we study taxonomy? a. b. D. Phylogenetic tree II. Evolution – change in species over time, due to: A. Natural Selection – process where organisms: 1. 2. 3. 4. Future generations have diverse traits that aid in survival B. Speciation – new species form, due to mutations or isolation mechanisms 1. Isolation mechanisms – organisms isolated from the rest of their kind; change over time, can no longer interbreed, new species can form 2. Isolation mechanism examples: III. Extinction – species disappear, 2 types: A. Background extinction 1. How often – ongoing, about 1 species every 1000 – 10,000 years 2. Causes – natural events, such as floods, tsunamis, volcanoes B. Mass Extinction 1. How often – has happened 5 times in Earth’s geologic history, millions of years apart 2. Causes – asteroids, massive volcanic eruptions, global warming 3. Human affects –
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IV. Ecology
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This note was uploaded on 04/27/2010 for the course BSC 1050 taught by Professor Jameslee during the Spring '09 term at Valencia.

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BSC 1050 unit 2 notes, handout - BSC 1050 - Unit 2,...

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