The present title “Dictionary of Genetics” aims to be a useful guide to the subject for the students and interested layman as well as for the academic botanists. It covers the subject from Mendelian Principles to Human Genetics. Terms related to other branches of Genetics like Molecular Biology, Cell Biology, Gene Biotechnology etc. are also included in the present volume. A dictionary which purports detail the words of a growing and changing “Science of Genetics” must of necessity confine much of its effort to reporting usage, and the ordinary disposition of a special terminology as it is revealed in the established and authoritative literature of the field. And while it is proper to stress the tentative character of some special terms, molecular biologists do find it necessary to speak a special vocabulary among themselves. To this special language this dictionary invites the reader