A molecular signpost used in eukaryotic gene isolation. Usually a RFLP probe or a primer site for DNA amplification.

in the genetic sense, an identification tag for a gene

a DNA sequence difference that can be identified by molecular methods

Français] gene or gene product of known location on the DNA strand that is used to mark other genes.

A molecular selection technique of DNA signposts which allows the identification of differences in the nucleotide sequences of the DNA in different individuals. Agriculture: a tool which allows crop geneticists and breeders to locate on a plant chromosome the genes( gene) for a trait of interest. It is considered more efficient than conventional breeding as it has the potential to greatly reduce development times and substitutes laboratory selection for much of the fieldwork.