Evolution Unit
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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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Created by:
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