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In a variety of contexts, exogeny or exogeneity (from Greek ἔξω éxō 'outside' and -γένεια -géneia 'to produce') is the fact of an action or object originating externally. It is the opposite of endogeneity or endogeny, the fact of being influenced from within a system.
An economic variable can be exogenous in some models and endogenous in others. In particular this can happen when one model also serves as a component of a broader model.
In 1928, bacteriologist Fredrick Griffith observed exogenous DNA alongside bacterial transformation in the species Streptococcus pneumoniae. [7] [3] In further tests, physician Oswald Avery was able to isolate and confirm that the DNA used in the experiment originated from outside the cell and integrated itself into the cell's genome.
Exogenous bacteria are microorganisms introduced to closed biological systems from the external world. [citation needed] They exist in aquatic and terrestrial environments, as well as the atmosphere.
Exogamy is the social norm of mating or marrying outside one's social group.The group defines the scope and extent of exogamy, and the rules and enforcement mechanisms that ensure its continuity.
The last image we have of Patrick Cagey is of his first moments as a free man. He has just walked out of a 30-day drug treatment center in Georgetown, Kentucky, dressed in gym clothes and carrying a Nike duffel bag.
Endogeny, in biology, refers to the property of originating or developing from within an organism, tissue, or cell. [1]For example, endogenous substances, and endogenous processes are those that originate within a living system (e.g. an organism or a cell).
Exogen may refer to: . an archaic term meaning a woody plant whose stem is formed by successive accretions to the outside of the wood under the bark; see Lindley system § Class VII: Exogens