BSC 1050 unit 2 notes, handout

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

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BSC 1050 - Unit 2, Evolution, Ecology & Species Interactions 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 – science of grouping & naming organisms 1. Taxonomists use scientific nomenclature, genus & species names 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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