Biology 16.3

Created by lcampana 

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11 terms

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; 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

also called premating isolation, occurs before fertilization

postzygotic isolation

also called postmating isolation, occurs after fertilization

sympatric speciation

occurs when two subpopulations become reproductively isolated within the same geographic area; proposed by Darwin

gradualism

the idea thta speciation ocurs at a regular, gradual rate

punctuated equilibrium

relative stability for long periods of time interspersed with much shorter periods during when many species become extinct and new species emerge; "punctuated" refers to sudden, rapid change and "equilibrium" refers to periods of little change

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