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Introgression, in genetics (particularly plant genetics), is the movement of a gene (gene flow) from one species into the gene pool of another by backcrossing an interspecific hybrid with one of its parents. Introgression is a long-term process; it may take many hybrid generations before the backcrossing occurs. An example of introgression is that of a transgene from a transgenic plant to a wild relative as the result of a successful hybridization leading to intentional or unintentional "genetic pollution". Another important example has been studied by Arnold & Bennett 1993: irises species from southern Louisiana.[1]
There is evidence that the introgression is a ubiquitous phenomenon in plants, even in animals[2][3] and perhaps it also exists among pre-human lineages (Holliday 2003[4]).
http://en.wikipedia.org/wiki/Introgressi
(ripped from wiki for quick reference)
10/11/08
Olive when we first meet her in Intro.
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