The book is basically intended to accompany a course in cytogenetics students of Genetics and Plant Breeding . Students are presumed to have knowledge of basics in genetics, cytology and plant breeding but in the present book with the help of diagrams and explanations it has been attempted that even a beginner could grasp the core elements of the subject. The book has been strictly organized on the basis of course curriculum being taught in Universities. All the topics covered in the book have been ordered in a crisp and comprehensible manner avoiding complexities of a traditional textbook since it is a simply a guide book to supplement but not supplant the main texts.