This is a concise guide to the combined use of classical and molecular methods for the genetic analysis and breeding of fungi. It presents basic concepts and experimental designs, and demonstrates the power of fungal genetics for applied research in biotechnology and phytopathology. Case studies of Saccharomyces cerevisiae, Candida albicans, Aspergillus niger, Neurospora crassa, Podospora anserina, Phytophthora infestans and others are included.