538 



INDEX 



Barren stalks, 16 



Biochemical basis for sulfonamide-requiring 

 character, 207-10 



Biochemical defects as gene markers, 256 

 Biochemical deficiencies, 257 

 Biochemical genetics, 256 



Biochemical models of heterosis in Neuro- 



spora, 199-217 

 Biochemical reactions essential to growth 



in Neurospora, 208-9 



Biochemical studies of auxotrophic mu- 

 tants, 275-78 



Biotypes, 20, 24 

 variation in, 26 



Bottleneck genes, 325, 327, 424, 428 



Bottleneck locus, 325 



Bottlenecks 



environmental components of, 329 

 genetic-environmental, 325 

 physiological, 325, 326 



"Breaking of the types," 15 



Breeding, practical necessities, 140 



Breeding plans 

 reciprocal selection between two cross- 



breds, 457 

 selection in crossbred to homozygous 



tester, 457 



Breeding plot efficiency, 146 



Breeding procedures, improvement limits, 

 416 



Breeding records 



of human beings, 2 



of primitive deities, 2 

 Breeding stations in Mexico, 426 

 Breeding systems, 414 

 Budding, 262-64 



Carboxylase, 110 

 Catalase activity, 108 

 Cattle cells, 252 



Causative genes 



action of, 255 



direct effect of, 239 



Cell membrane and cell wall, 262 



Cellular antigens in humans, 240-43 



Cellular characters within a species, 251-55 



Centrochromatin, 262 



Centromere region, 72, 74 



Centrosome, 261 



Character complexes, importance in maize 

 breeding, 131 

 extrapolated correlates, 131 



Chemical analyses of genetic variations in 

 flower color, 237 



Chemistry of A and B substances, 241 



Chiasmata formation among three chromo- 

 somes, 69 



Chlorophenoxyacetic acid, 117 

 ortho, para, and meta forms, 117 



Chlorophyll production in maize, 228-29 



Choline, 214 



Choosing testers, 449 



Chromatin bridge, 78 



Chromogenes and plasmagenes in heterosis, 

 224-35 



Chromomere pattern, 68 



Chromonemata, 74 



Chromosomal and cytoplasmic basis for hy- 

 brid vigor, 479-81 



Chromosomal deletions, 226 



Chromosomal effects, variance analysis of, 

 483 



Chromosomal fibers, 72, 74 

 formation, 75 



Chromosomal inheritance, 258-59 



Chromosomal rearrangements, 227 



Chromosome doubling, 390-92 



Chromosome knob number, 419 



Chromosome knobs 

 distribution in Northern Flints, Southern 



Dents, and Corn Belt inbreds, 130 

 significance, 185-86 



Chromosome length, effect on hybrid vigor, 



484 

 Chromosome maps of Saccharomyces, 258 

 Chromosome mechanisms, 153 

 Chromosome movement, 74 



Chromosome 10, 67, 69 

 abnormal, 68, 72 

 kinds, 66 



Chromosomes 



block transfer, 187 

 breakage, 74 



of maize and teosinte, 183 

 and nuclear membrane, 262 



Co-carboxylase, 110 



Colchicine, 397 



Combining ability, 62, 141, 148, 330-51, 

 386,399,408,409, 431,485 

 general, 328, 364 



general and specific, 352-70, 485-90 

 and morpholog}', correlation of, 143-45 

 and morpholog>', experimental results, 



143-45 

 specific, 352-53 

 testing for, 444 

 tests for, 449 



Commercial corn growing areas in Mexico, 



426 

 Commercial corn hybrids, 232 



Commercial corn production, 373 



