Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Monograph. Lederberg, Joshua. "Genetics." Encyclopedia Britannica Yearbook of Science and the Future, 1969 ed., s. v. "Genetics.". Encyclopedia Britannica, 1969. Article. 4 Images.. Lederberg UI. P158