%iii CONTENTS 



29 Extranuclear Genes 369 



30 The Genetic Control of Mutation 383 



31 The Molecular Basis of Mutation 391 



32 Gene Action and Polypeptides 404 



33 Polypeptide Synthesis and RNA 42J 



34 Genetic Amino Aeid Coding 436 



35 Regulation of Gene Synthesis 449 



36 Regulation of Gene Action — Operons 457 



37 Regulation of Gene Action — Gene Control Systems in Maize 465 



38 Regulation of Gene Action — Position Effect in Drosophila 473 



39 Regulation of Gene Action — Dosage Compensation 484 



40 Regulation of Gene Action — Its Molecular Basis in Higher 



Organisms 492 



41 Regulation of Gene Action — Growth, Differentiation, and 



Development 501 



42 The Origin and Evolution of Genetic Material 509 



Appendix — Elementary Biometrical Inferences 

 Supplements 5-7 



519 



) from Gregor Mendel to C. Nageli s-9 



934) of Thomas Hunt Morgan s-15 

 946) of Hermann Joseph Muller 5-79 

 962) of Maurice H. F. Wilkins s-31 

 959) of Arthur Romberg s-60 

 958) of George Wells Beadle s-75 

 958) of Edward Lawrie Tatum s-88 



958) of Joshua Lederberg s-98 

 962) of James Dewey Watson 5-77/ 

 962) of Francis H. C. Crick s-135 



