X CONTENTS 



27 Mutation and Selection — Nonrandom Mating and Heterosis 229 



*28 Mutational Loads and Their Consequences to Populations 239 



29 Races and the Origin of Species 252 



30 Developmental Genetics 262 



*31 Biochemical Genetics (I) 271 



*32 Biochemical Genetics (II) 281 



*33 Chemical Nature of Genes 293 



*34 Organization, Replication, and Types of DNA in Vivo 306 



*35 Replication of DNA in Vitro 320 



*36 Bacteria: Clones and Mutation 329 



*37 Bacteria: Recombination (I. Transformation and Chain Recombination in 



Vitro) 340 



*38 Bacteria: Recombination (II. Conjugation) 349 



*39 Bacteria: Recombination (III. The Episome F) 356 



*40 Bacteria: Recombination (IV. Episomes and Nucleotide-Sharing) 366 



*41 Bacteria: Recombination (V. Transduction) 374 



*42 Viruses: Recombination in Bacteriophage (I) 382 



*43 Viruses: Recombination in Bacteriophage (II) 390 



*44 Viruses: Bacterial, Animal, and Plant 400 



45 Extranuclear Genes and Their Interrelations with Nuclear Genes 409 



*46 Gene Action and Operons 421 



*47 Gene Action and Amino Acid Coding 427 



48 The Biochemical Evolution of Genetic Material 439 



*49 Genes — Nature and Consequence 444 



Author Index, 453 Subject Index, 457 



Supplements: 



I Part of a Letter {1867) from Gregor Mendel to C. Ncigeli 



II Nobel Prize Lecture {1934) of Thomas Hunt Morgan 



III Nobel Prize Lecture {1946) of Hermann Joseph Muller 



IV Nobel Prize Lecture {1958) of George Wells Beadle 

 V Nobel Prize Lecture {1958) of Edward Lawrie Tatum 



VI Nobel Prize Lecture {1959) of Arthur Kornberg 



VII Nobel Prize Lecture {1958) of Joshua Lederberg 



