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11 Cards in this Set

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the rise of many new species in a relatively short time as a result of a single species that invades different habitats and evolves under different environmental pressures in those habitats
Adaptive Radiation
speciation that occurs when two populations are separated by a physical barrier that prevents gene flow between them (geographical isolation)
Allopatric Speciation
the death of all members of a species
a morphological, physiological, behavioral, or ecological difference that prevents members of two species from interbreeding
Isolating Mechanism
having more than two homologous chromosomes of each type
any structure, physiological function, or developmental abnormality that prevents organisms of two different populations, once mating has occurred, from producing vigorous, fertile offspring
Postmating Isolating Mechanism
any structure, physiological function, or behavior that prevents organisms of two different populations from exchanging gametes
Premating Isolating Mechanism
the failure of organisms of one population to breed successfully with members of another; may be due to premating or postmating isolating mechanisms
Reproductive Isolation
the process of species formation, in which a single species splits into two or more species
the basic unit of taxonomic classification, consisting of a population or series of populations of closely related and similar organisms. In sexually reproducing organisms, a species can be defined as a population or series of populations of organisms that interbreed freely with one another under natural conditions but that do not interbreed with members of other species.
speciation that occurs in populations that are not physically divided; normally due to ecological isolation or chromosomal aberrations (such as polyploidy)
Sympatric Speciation