In the present book an attempt has been made to present a reappraisal of theory and practice on the developments made in the form of chapters written by eminent scholars and workers without making much changes to their original contributions. The book includes 15 chapters covering areas of tree improvement (chapter 1-7) clonal forestry (Chapter 8) cytogenetics (Chapter 9) reproductive biology (Chapter 10-11) isozymes (Chapters 12-14) and biotechnology (Chapter 15). The topics of different chapters have so chosen as give a comprehensive idea about forest genetics and tree breeding. An exhaustive list of references has  included at the end of each chapter enabling readers to have an access to the original source of information. The present book has been designed as a text-cum-reference book for post-graduate students research teachers and undergraduate students specializing in advance course of forest genetics and tree improvement.