Abstract
Genetic background can have subtle or profound effects on mutant phenotypes, providing additional information regarding the function of the gene. If your mutation is maintained on one genetic background but you wish to analyze it on another, it is a simple matter to transfer the mutation to a recipient strain background by repeated backcrossing (introgression) as detailed in this protocol. The resulting strain is called a congenic strain, defined as a strain carrying the mutation within a segment of chromosome from the donor strain with the remainder of the genome from the recipient strain.
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