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Vocabulary 16.3

Formation of Species

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 concept that species is a population of organisms that can interbreed but cannot breed with other populations
Geographic Isolation The physical separation of populations due to geographic barriers that prevent interbreeding
Allopatric Speciation Happens 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 related species
Prezygotic Isolation Reproductive isolation before fertilization
Postzygotic Isolation Reproductive isolation after fertilization
Sympatric Speciation Occurs when 2 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: GutzwillerL19
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