| 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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| congenic strain | An inbred strain of animals produced by continued crossing of a gene of one line onto another inbred (isogenic) line. (05 Mar 2000) |