This book will serve as a valuable research and teaching reference. The collection of papers will provide knowledge from which to launch new research efforts on the nature of the inheritance of quantitative traits as well as the development of new technologies for improving such traits. Hopefully, it will stimulate expanded efforts to exploit the full potentialofgenomics,bioinformaticsandmolecular-enhancedbreedingtechnologiesinthe study and utilization of quantitative variation in plant and animal species.