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Bio 1b

Bio 1b - Term Definition 4 ideas that are the basis of...

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Term: 4 ideas that are the basis of natural selection Definition: Variability, heritability, variation in survival and reproduction, selection Term: 3 components of a successful theory of evolution Definition: (1) The fact of evolution. We can observe that organisms change over time. (2) The pattern of evolution. How exactly do species change over time? Is the change abrupt, or do species change gradually? (3) The mechanism (process) of evolution. What causes species to change over time? Term: Problem with finding a mechanism Definition: To find a possible mechanism, we must make an assumption: Uniformatism Term: Uniformitarianism Definition: : Proccesses that occur today, must have occurred in the past
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Term: Uniformitarianism cont. Definition: 1. alternative is that processes were different than they are today: supernaturalism or magic 2. It does not mean that all processes are slow ad gradual--> abrupt processes: volcanos, earthquakes, floods. 3. Uniformitarianism does not imply that rules governing change in the past (and present) are perfectly understood or predictable Term: Theory that Darwin and Wallace comprised Definition: Descent with modification Term: Darwin's significant contribution Definition: Darwin also had something to say about the pattern of evolution. He argued (strongly) that species change gradually over time. Most importantly, Darwin was the first to propose a mechanism of evolution, called natural selection. Term: Darwin's observation of domestic animals Definition: 1. Individuals vary 2. Heritable: offspring resemble their parents 3. Selective breeding: breed selectively for certain traits
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Term: Variation in the Wild: Definition: degree of variation in the wild seems to be the same as domesticated animals Term: Darwin and Natural Theology Definition: He debunked the belief that all organisms lives harmoniously in the wild--> struggle for existence is the infinite growth of individuals Term: Natural selection Definition: Individuals with an advantageous trait for survival and reproduction will reproduce more offspring--> next generation will produce more offspring--> their population is favored Term: Evolution species vs: individual Definition: An individual does not evolve, the composition of the traits of the individual change which causes the evolution of the species.
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Term: Transitional forms Definition: gradation between species: 1) rocks have transitional forms--> however the fossil record is missing such that there is a rarity of fossilization 2)
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