
In genetics, two organisms that differ in only one locus are defined as congenic or coisogenic. ==Generating congenic strains== Congenic strains are generated in the laboratory by mating two inbred strains (usually rats or mice), and backcrossing the descendants 5-10 generations with one of the original strains, known as the recipient strain. Typi...
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http://en.wikipedia.org/wiki/Congenic

<cell biology> Organisms that differ in genotype at (ideally) one specified locus. Strictly speaking these are conisogenics. Thus one homozygous strain can be spoken of as being congenic to another. ... (18 Nov 1997) ...
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Organisms that differ in genotype at (ideally) one specified locus. Strictly speaking these are conisogenics. Thus one homozygous strain can be spoken of as being congenic to another.
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Type: Term Pronunciation: kon-jen′ik Definitions: 1. Relating to an inbred strain of animals produced by repeated crossing of one gene line onto another inbred (isogenic) line.
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http://www.medilexicon.com/medicaldictionary.php?t=19799

Animals that only differ only at a single genetic locus.
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http://www.roitt.com/glossary.asp
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