A gene with a clear-cut phenotype (and often a known location on a chromosome) that is used as a point of reference when mapping or selecting another gene at a nearby locus.

A gene or short sequence of DNA that acts as a tag for another, closely linked, gene.

Gene used during genetic engineering attempts that helps to identify cells that have received new DNA. Genes usually include either a selection advantage, e.g., antibiotic or herbicide resistance, or visualization advantage, e.g., beta glucuronidase (GUS) or green fluorescent protein (GFP) expression.

A gene, whose presence is easily detectable, which is inserted into a GMO along with the desired gene. The presence of the marker gene allows scientists to know that the insertion of the desired genes has been successful.

Genes that identify which plants have been successfully transformed.

An easily identified gene that is inserted into the organism, along with the desired gene. The presence of the marker gene tells researchers that the transformation was successful.

gene used during genetic engineering that helps to identify cells that have succesfully received and incorporated into their genome new DNA. Genes usually include either a selection advantage, e.g., antibiotic or herbicidetolerance, or visualization advantage (a trait, when expressed, that is visible to the naked eye).

A gene which facilitates the identification of organisms which have taken up recombinant DNA molecules.

(n) A part of a gene which indicates the presence of genetic modification

Gene that is easy to find or observe. Attaching a marker gene to another gene that is hard to find, such as an antisense gene, is like putting a reflective collar on a dog so you can see the collar at night - even though you cannot see the dog, you know where it is. See antisense.

A marker gene is used in molecular biology to determine if a piece of DNA has been successfully inserted into the host organism. There are two types of marker genes: selectable markers and markers for screening.