GGT stands for Graphical GenoTypes. A graphical representation of molecular marker data can be an important tool in the process of selection and evaluation of plant material. A computer program was developed that enables representation of molecular marker data by simple chromosome drawings in several ways. Commonly used marker file types that contain marker information serve as input for this program, which was named ‘GGT’. Besides representation, GGT can also be used for selection or filtering and much more!