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Biology Chapter 16.3

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 a 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. Allopatric means different homelands.
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 Occurs before fertilization.
Postzygotic Isolation Occurs after fertilization.
Sympatric Speciation Occurs when two subpopulations become reproductively isolated within 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: DragonT20