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MB 16.3

MB Chapter 16, Section 3

TermDefinition
speciation the formation of new species as a result of evolution
morphology the study of the structure and form of an organism
biological species concept the principle that defines a species as a group of organisms whose members can interbreed to produce offspring
geographic isolation the physical separation of populations due to geographic barriers that prevent interbreeding
allopatric speciation when species arise as a result of geographic isolation
reproductive isolation the inability of members of a population to successfully interbreed with members of another population of the same or a related species
prezygotic isolation a type of reproduction isolation that occurs before fertilization
postzygotic isolation a type of reproductive isolation that occurs after fertilization
sympatric speciation when two subpopulations become reproductively isolated within the same geographic area
gradualism a model of evolution in which gradual change over a long period of time leads to biological diversity
punctuated equilibrium a model of evolution in which short periods of drastic change in species, including mass extinctions and rapid speciation, are separated by long periods of little or no change
Created by: simmonsr20