INDEX 



539 



Commercial hybrids, 291 

 origin of, 401 



Complementary genes, 48 



Compound genes and genes with multiple 

 effects, 227-29 



Conidia, formation, 201 



Conidiophore, 201 



Constant parent regression, 287 



Controlled cross-pollination in breeding 



corn, 16 

 Controlled parentage, 16 

 Controlled self-pollination, 16 

 Convergent improvement, 328 

 Corn {See also Maize) 



grown in prehistoric times, 418 

 improvement through breeding, 425-48 

 inbred lines, 280 

 selfing and crossing results, 36 

 Corn Belt dents 

 association of characters in 

 inbreds, 131 



open-pollinated varieties, 131 

 derived from hybridization between 

 Southern Dents and Northern Flints, 

 132 

 origin of, 124-48 

 historical and archaeological evidence, 

 148 

 taxonomically important differences, 132 

 width of cross, 132-37 

 Corn Belt inbreds, 147 

 characteristics, 130 



distribution of chromosome knobs, 130 

 Corn Belt maize 

 archaeological record, 127 

 Caribbean influence, 127 

 cytology, 128-29 

 description, 125 

 historical record, 127 

 origin, 127 



genetic evidence, 129-32 

 and genetic significance, 124-48 

 understanding variability in, 148 

 variation, 146 



Corn belt of Mexico, 436 



Corn breeding 

 history, 400-406 

 pure line method, 28 

 steps, 470 



Corn breeding methods 



ear-to-row, 400 



mass selection, 400 



selection within and among inbred lines, 

 401-2 



varietal hybridization, 400 

 Corn evolution in Mexico, 419 

 Corn hybrids, commercial, 232 

 Corn improvement program of Mexico, 425 

 Corn production, pure line method, 44 

 Corn races in Mexico, 427 



Corn and swine inbreeding 

 degree of heterozygosity, 338 

 effectiveness of continued phenotypic se- 

 lection, 338 



Corn, white dent, 21 



Cousin crosses, 31 



Cozymase, 110 



Cross-fertilization, 15, 16, 17, 45 

 in alfalfa, 81 

 in maize, 49 



Cross-fertilization versus self-fertilization, 

 20 



Cross performance, 347 

 improvement, 351 

 initial, 343, 351 

 limits, 351 



Cross-pollinated and self-pollinated plants, 

 comparison of methods, 55 



Cross-pollination, 15 



Crossbred performance, 402 



Crossbreeding, 171-73 



early ideas on, 1-13 



effect on seed collapse in Medicago saliva, 

 85-89 



effects on growth, 81 



and inbreeding effects, 331-32, 350 



livestock, 372 



in seed development, 81-97 



USDA experiments, 375 



Universitv of Minnesota experiments, 

 371-76" 



Crossbreeding, rotational 



advocation, 375 



farm applications, 377 



and heterosis, 371-77 



inbred lines, 376-77 



for swine, 375 



versus inbreeding, 7 

 Crossbreeding swine, 371-76 



University of Minnesota experimental 

 results, 373-74 



Crossing, 12, 139, 382 

 advantageous effects, 23 



Crossing inbred lines of tomatoes, 307-10 

 Crossing over, 68, 222 



in maize X teosinte, 187 

 Cysteine requirers, 276 



Cytology and genetics of Saccharomyces, 

 256-66 



Cytoplasm, 261 



and genes, interaction, 232-33, 479 

 Cytoplasmic inheritance, 266 



Dauermodifikation, 260-61 



Decarboxylating enzyme systems of the 

 respirator}- mechanism, 110 



Dehydrogenase enzymes, 110 



Deleterious dominant, 323 



Deleterious recessives, 220, 323 



