Notes for quiz 1 for BILD 3

Notes for quiz 1 for BILD 3 - Darwin’s theory 1. Species...

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Darwin’s theory 1. Species are mutable: Observed on Galapagos that species change over time and can give rise to new species over time (Lamarck’s theory too). Darwin realized that environment determines what kind of organisms live there. 2. Natural selection can give rise to new species/adaptations: Malthus: unchecked population growth leads to an exhaustion of resources, so only the best-adapted survive (struggle for existence). Resources grow arithmetically, populations grow exponentially (populations outstrip their resources). 3. Natural and artificial selection=similar, but not the same: Humans can choose favorable characteristics for plants/animals and breed them to make more. (Produce changes over short periods of time) 4. Variation must be heritable: Descent with modification = the best adapted individuals pass on their characteristics to next generation, mutational change = change in genetic material, how modifications arise 5. Evolution is gradual: evolution occurs in small steps, not large leaps or “saltations”, mutants or “sports” could arise, new varieties of species could arise 6. Evolution has no goal: There is no guider in evolution/no direction/no goal. It can go any direction. Rudimentary organs get smaller due to their insignificance. Natural
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This note was uploaded on 04/20/2008 for the course BILD 3 taught by Professor Wills during the Fall '07 term at UCSD.

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Notes for quiz 1 for BILD 3 - Darwin’s theory 1. Species...

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