Genetics and Molecular Biology
S E C O N D E D I T I O N
Robert Schleif
Department of Biology
The Johns Hopkins University
Baltimore, Maryland
The Johns Hopkins University Press Baltimore and London
1986 by Addison-Wesley Publishing Company
1993 by Robert Schleif
All rights reserved
Printed in the United States of America on acid-free paper
The Johns Hopkins University Press
2715 North Charles Street
Baltimore, Maryland 21218-4319
The Johns Hopkins Press Ltd., London
Genetics and Molecular Biology