Abstract
The problem of genetic linkage between an allele to be transferred froni a donor parent and alleles with negative effects on any quantitative trait is investigated theore-tically in relation to sLrccess in backcross breeding programs. A method is outlined for detecting the effect of such linkage. The amount of data required is discussed in terms of the power of the statistical test for the linkage detection. Useful procedureL when linkage is found to be present is also discussed.