INDEX 



541 



nature, 9 



nutritive functions, 97 



Environment-genotj'pe interaction in het- 

 erosis, 488-91, 493 



Environmental variances, 169 



Enzyme system, 103 



Enzymes, 112, 115, 256 



alpha methyl glucosidase, 257 

 galactase, 257 

 maltase, 257 

 melibiase, 257 

 sucrase, 257 



Epistasis, 330, 331, 334, 353, 402, 458, 465, 

 486, 500, 501, 502 



biases resulting from, 515 



in corn yields, 286 



graphic transformation removal, 465 



Epistatic effects, 168 



Equilibrium factor, 103 



Equilibrium frequencies, 346 

 of genes, 446-67 



Equilibrium gene frequency with over- 

 dominance, 463-64 



Essential metabolite, 115, 116, 117 

 relation to growth, 115-17 



Euchlaena {See Teosinte) 



Euheterosis, 218-23, 296 



balanced, 221-22 



mutational, 218-20 



Evening primroses, 20 



Evolution {See also Introgression) 

 of maize, 176 



Evolution of corn in Mexico, 425 



factors involved, 419 

 Excised tomato roots, 116 



heterotic vigor in, 122 



Exogamy, 4 



Experimental designs, 494-96 



Experimental procedures used at North 

 Carolina Experiment Station, 494-96 

 analysis of data, 496-97 

 experimental designs, 494-96 



Extrachromosomal inheritance, 260-61, 

 264-66 



Extrapolated correlates, method of, 130, 

 148 



Female gametophyte, 90 



Fertilization 

 in the angiosperms, 83 

 in the gymnosperms, 83 



First generation hybrids, 165-66, 174 



First generation intervarietal hybrids, 172 



First generation selfed lines, 448 



Flagellar antigens, 268 



Flint corn, 24 



Flint-Dent ancestry in corn breeding, sig- 

 nificance, 146-48 

 Flour corns, 420 



Fodder, maize X teosinte, 187-88 

 Forssman antigen, 250 

 "Four-way" crosses, 40, 42, 43 



Frequency distribution of two types of 

 samplings, 404 



Fruit, weight of and its component char- 

 acters, 306-7 



Fungi growth, 115 



Galtonian regression, 23 



Gamete selection, 60, 61, 382-86, 399 

 method, 387 

 sources of 



synthetic varieties, 378 



single or more complex crosses, 378 



inbred lines, 378 

 for specific combining ability, 378-88 



Gamete selection program, feasibility of, 

 388 



Gene action, 326 

 and overdominance, 294-96 

 types of, 225 



Gene combinations, 420-23 



Gene-controlled characteristics 

 chlorophyll deficiencies, 102 

 flowering pattern, 102 

 leaf form and pigmentation, 102 

 stalk abnormalities, 102 

 time of flowering, 102 



Gene division, 259 



Gene dosage, 237 



Gene effects, 154 

 in a series of reactions, 237-39 

 specificity of, 236-55 



Gene frequency, 341 

 equilibrium, 336 



Gene interaction, 245, 330 

 in heterosis, 320-29 



Gene pairs differentiating parents, 310-14 

 Gene recombination and heterosis, 298-319 

 Gene specificity, 237, 325 

 Genes, 265 



accumulation of favorable dominant ef- 

 fects and general physiological inter- 

 action, 235 



affected by environment, 62 



complementary, 48 



compound and with multiple effects, 

 227-29 



controlling growth, 230-32 



and cytoplasm, interaction, 232-33, 480 



direct effects, 239-40 



without dominance, 227 



dominant and recessive, 225-26 



equilibrium frequencies, 446-67 



estimation of dominance, 494-516 



