Genetic counseling is widely accepted as an integral part of the management of every patient with an inherited disorder, and the rapid developments in human and medical genetics have reinforced the importance of competency in risk calculation. Fully updated since the first edition (1991) this book provides a simple introduction for risk calculation for genetics counseling,, describing how risks can easily be estimated or calculated for most counseling situations. Easy-to-use, with worked examples, this book covers all patterns of inheritance. In this second edition, Introduction to Risk Calculation in Genetic Counseling now includes a chapter on cancer genetics, and there are also new sections on anticipation, gonadal mosaicism, the potential use of susceptibility loci, three-way chromosome translocations and meiotic drive.