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9 terms

Vocab Chap15

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biological species concept
definition of a species as a population or group of populations whose members can breed with one another in nature and produce fertile offspring
macroevolution
major biological changes evident in the fossil record
speciation
formation of new species
reproductive isolation
condition in which a reproduction barrier keeps two species from interbreeding
geographic isolation
separation of populations as a result of geographic change or migration to geographically isolated places
adaptive radiation
evolution from a common ancestor of many species adapted to diverse envrioments
punctuated equilibrium
evolutionary model suggesting species often diverge in spurts of relatively rapid change, followed by long periods of little change
embryology
study of multicellular organism as they develop from fertillized eggs to fully formed organisms
geologic time scale
Earth's history organized into four eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic