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Evolution Unit

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Term
Definition
Natural Selection   The process that results in living things with beneficial traits producing more offspring than others. Changes the traits of living things over time.  
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Jean Baptiste Lamarck (1744-1829)   Argued that species change over time. His idea of inheritance of acquired characteristics is incorrect. Traits an organism develops during its own lifetime cannot be passed on to an offspring.  
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Charles Lyell (1797-1875)   Argued that gradual geological processes have gradually shaped Earth's surface. He believes Earth is older than most people believe.  
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Thomas Malthus (1766-1834)   Argued that human populations grow faster than the resources they depend on. When populations become too large, famine and disease break out.  
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Artificial Selection   The breeding of plants or animals desirable traits. The opposite is called natural selection.  
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Alfred Russel Wallace   English naturalist that traveled places to study the environment and had the same theory as Darwin.  
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Charles Darwin   Creator of evolution.  
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Paleontologists   Scientists who find and study fossils.  
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Comparative Anatomy   The study of similarities and differences in the structures of different species.  
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Homologous Chromosomes   Structures that are similar in related organisms because they were inherited from a common ancestor.  
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Analogous   Structures that are similar in unrelated organisms because they evolved to do the same job, not because they were inherited from a common ancestor.  
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Comparative Embryology   The study of the similarities and differences in the embryos of different species. Similarities is the evidence of common ancestry.  
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Vestigial Structure   Evolution has reduced their size because the structures no longer used.  
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Biogeography   The study of how and why plants and animals live where they do.  
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Microevolution   Occurs over a relatively short period of time within a population or species.  
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Genotype   Genetic makeup of an individual.  
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Gene Pool   A population that consists of many genotypes.  
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Allele Frequency   The amount of times the allele occurs in a gene pool relative to the other alleles for that gene.  
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Evolution Occurring   Occurs in a population when allele frequencies change over time.  
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The Hardy- Weinberg Theory   Shows that allele frequencies do not change in a population if certain conditions are met.  
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Forces of Evolution   Mutation, gene flow, genetic drift, and natural selection.  
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Mutation   Creates a new genetic variation in a gene pool.  
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Gene Flow   Occurs when individuals move into or out of a population.  
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Genetic Drift   A random change in allele frequencies that occurs in a small population.  
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Bottleneck Effect   Occurs when a population suddenly gets much smaller.  
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Founder Effect   Occurs when a few individual start, or found, a new population.  
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"Fit for the environment"   Organisms that are better adapted to the environment.  
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Polygenic Traits   Stabilizing selection, directional selection, distributive selection.  
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Stabilizing selection   Occurs when phenotypes at both extremes of the phenotypic distribution are selected against.  
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Directional Selection   Occurs when one of the two extreme phenotype is selected for.  
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Distributive Selection   Occurs when phenotypes in the middle of the range are selected against.  
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Macroevolution   Occurs over geologic time above the level of the species.  
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Speciation   Process by which a new species evolves.  
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Allopatric Speciation   Species that are unable to interbreed.  
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Sympatric Speciation   New species arises without geographic separation  
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Coevolution   When species in symbiotic relationships evolve together.  
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Gradualism   Occurs gradually due to stable geologic and climate conditions.  
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Punctuated Equilibrium   Occurs rapidly because of geologic and climate conditions changing  
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