Basics -- The Principle: Identification and Application of Molecular Markers -- Genotyping Tools in Plant Breeding: From Restriction Fragment Length Polymorphisms to Single Nucleotide Polymorphisms -- A Model Crop Species: Molecular Markers in Rice -- From Markers to Cloned Genes: Map-Based Cloning -- Specific Crops -- DNA Markers in Brassica: Use of Genetic Information from Arabidopsis and Dev…