comparative positional candidate gene 1 topic · 1 source Science› Biotechnology and GeneticsFood BiotechnologyRelates to an indirect means of assigning function to a QTL. Where a QTL has been linked to a marker in one species, and that same marker is linked to a known gene in a model system, inferences may be drawn as to the nature of the QTL.UN Food and Agriculture Organization — Glossary of Biotechnology for Food and Agriculture Cite