determine the source that contributes the allele for particular QTL?

[Arasi]

Could  Rqtl be able to determine the sources indicating which parental line contributes the resistance allele for particular QTl.

[Karl Broman]

You can use the functions plotPXG() or effectplot() to plot the phenotype vs the genotype at a locus.

Or you can use the function fitqtl() with get.ests=TRUE to get estimated QTL effects.

karl