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AP Environmental Science
Chapter 5 APES
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Environmental Science
AP Environmental Science
12th
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32 Terms
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Species richness
The number of species in a given area.
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Species evenness
The relative proportion of individuals within the different species in a given area.
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Phylogeny
The branching pattern of evolutionary relationships.
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Evolution
A change in the genetic composition of a population over time.
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Microevolution
Evolution below the species level.
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Macroevolution
Evolution that gives rise to new species, genera, families, classes, or phyla.
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Gene
A physical location on the chromosomes within each cell of an organism.
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Genotype
The complete set of genes in an individual.
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Phenotype
A set of traits expressed by an individual.
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Mutation
A random change in the genetic code produced by a mistake in the copying process.
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Recombination
The genetic process by which one chromosome breaks off and attaches to another chromosome during reproductive cell division.
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Evolution by artificial selection
The process in which humans determine which individuals breed, typically with a preconceived set of traits in mind.
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Evolution by natural selection
The process in which the environment determines which individuals survive and reproduce.
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Fitness
An individual’s ability to survive and reproduce.
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Adaptation
A trait that improves an individual’s fitness.
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Gene flow
The process by which individuals move from one population to another and thereby alter the genetic composition of both populations.
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Genetic drift
A change in the genetic composition of a population over time as a result of random mating.
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Bottleneck effect
A reduction in the genetic diversity of a population caused by a reduction in its size.
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Extinction
The death of the last member of a species.
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Founder effect
A change in the genetic composition of a population as a result of descending from a small number of colonizing individuals.
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Geographic isolation
Physical separation of a group of individuals from others of the same species.
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Allopatric speciation
The process of speciation that occurs with geographic isolation.
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Reproductive isolation
The result of two populations within a species evolving separately to the point that they can no longer interbreed and produce viable offspring.
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Sympatric speciation
The evolution of one species into two, without geographic isolation.
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Genetically modified organism (GMO)
An organism produced by copying genes from a species with a desirable trait and inserting them into another species.
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Range of tolerance
The limits to the abiotic conditions that a species can tolerate.
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Fundamental niche
The suite of abiotic conditions under which a species can survive, grow, and reproduce.
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Realized niche
The range of abiotic and biotic conditions under which a species actually lives.
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Distribution
Areas of the world in which a species lives.
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Niche generalist
A species that can live under a wide range of abiotic or biotic conditions.
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Niche specialist
A species that is specialized to live in a specific habitat or to feed on a small group of species.
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Mass extinction
A large extinction of species in a relatively short period of time.
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