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Bio.Vocab. Evolution

Spontaneous Generation An eaerly and now disproved theory that living organisms come to life spontaneously from nonliving material
Radiometric Dating A method of determining the absolute age of an object by comparing the relative percentages of a radioactive isotope and a stable isotope
Radioactive Isotope An isotope that has an unstable nucleus and that emits radiation
Half life The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
Endosymbiosis A mutually beneficial relationship in which one organism lives within another
Evolution A heritable change in the characteristics within a population from one generation to the next
Natural Selection The process by which individuals that're better adapted to their environment survive and reproduce more successfully than less well adapted individuals do
Adaptation The process of becoming adapted to an environment
Fitness A measure of an individual's heredity contribution to the next generation
Superposition A principle that states that younger rocks lie above older rocks if the layers haven't been disturbed
Phylogeny The evolutionary history of a species or taxonomic group
Convergent Evolution The process by which unrelated species become more similar as they adapt to the same kind of environment
Coevolution The evolution of two or more species that's due to mutual influence, often in a way that makes the relationship more mutually beneficial
Divergent Evolution The process by which two or more related but reproductively populations become more and more dissimilar`
Artificial Selection The selective breeding of organisms for specific desirable characteristics
Immigration The movement of an individual or group into an area
Emigration The movement if an individual or group out of an area
Sexual Selection An evolutionary mechanism by which traits that increase the ability of individuals to attract or acquire mates appear with increasing frequency in a population
Stabilizing Selection A type of natural selection in which the average form of a trait is favored and becomes more common
Disruptive Selection A type of natural selection in which two extreme forms of a trait are selected
Directional Selection A type of natural selection in which the most extreme form of a trait is forvored and becomes more common
Speciation The formation of new species as a result of evolution
Reproductive Isolution The inability of members of a population to successfully interbreed with members of another population of the same or a related species
Geographic Isolation The physical separation of populations due to geographic barriers that prevent interbredding
Homologous Structures Anatomical structures in one species that, compared to other anatomical structures in another species, originated from a single anatomical structure in a common ancestor of the two species
Analogous Structure An anatomical structure in one species that's similar in function and appearance, but did not in evolutionary origin, to another anatomical structure in another species
Created by: archergirl