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23 Cards in this Set
- Front
- Back
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allele frequency
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the percentage of a an allele in a gene pool
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assortative mating
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the selection of a mate based on the similarity of characterisitcs
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bell curve
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illustrates that most members of a population have simmilar values for a given, measurable trait
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bioogical species concept
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the principle that defines a species as those organisms that can produce offspring together
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directional selection
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individuals that have a more extreme form of a trait have better fitness than individuals with an average form of a trait
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disruptive selection
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individuals with either extreme variation of a trait have greater fitness than those with the average form of the trait
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emigration
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the movement of individuals out of a population
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gene flow
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the process of genes moving from one population to another
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gene pool
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the total genetic information available in a population
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genetic drift
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allele frequencies in a population change as a result of random events, or chance
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geographic isolation
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the physical separation of members of a population
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Hardy-Weinberg principle of genetic equillibrium
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Population no longer evolving:
1. no net mutations occur 2. no emigration or immigration 3.population is large 4. individuals mate randomly 5. selection does not occur |
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immigration
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the movement of individuals into a population
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morphology
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the study of internal and external structure and form of an organism
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phenotype frequencey
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the ratio stating the number of times a specific phenotype occurs in a population in a single generation
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poulation genetics
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the study of evolution from a genetic point of view
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postzygotic isolation
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a barrier tp successful breeding that occurs after fertilization, such as the production of nonviable or sterile offspring
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prezygotic isolation
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a barrier to successful breeding that occurs before fertilization, such as differences in mating time of behavior
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punctuated equilibrium
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a theory that speciation occurs during brief periods of rapid genetic change
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reproductive isolation
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the inability of formerly interbreeding organisms to produce offspring
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sexual selection
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the preferencial choice of a mate based on a specific phenotypic trait
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speciation
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the formation of a new species
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stabilizing selection
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a type of natural selection in which th average form of a trait causes an organism to have an advantage in reproduction
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