This volume of Genetics Today presents the proceedings of the XI International Congress of Genetics, held in The Hague in 1963. Featuring contributions from leading scientists from around the world, this volume covers a wide range of topics in genetics, from the molecular basis of inheritance to the genetic basis of disease. An indispensable resource for geneticists and researchers in related fields. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.