542 



INDEX 



Genes — Continued 



interallelic interactions, 319 



manifold effects of, 340^41 



pairing of, 371 



in the synthesis of arginine, 239 



transferred to a native population, 421 

 General combining ability, 352, 487-91 



definition, 454 



recurrent selection for, 470 



General and specific combining ability, 



352-70, 487 

 General and specific combinability, relative 



importance of, 451, 487 

 Genetic correlations, negative, between 



components of total performance, 



337-38 

 Genetic implications of mutations in S. 



typhimurium, 267-81 

 Genetic intermediates, 332, 334 



optimum, 331 

 Genetic interpretation of regressions, 462- 



65 

 Genetic interpretations of components of 



variance between progenies, 503-9 

 Genetic mechanisms and heterosis, 100-103 

 Genetic nature of components of progeny, 



variance, 498 

 Genetic and phenotypic covariances and 



correlations, 515 

 Genetic structure of natural populations, 



152 



Genetic variability, 331 

 in economic characters of swine, sum- 



mar}-, 350 

 Genetic variation in economic traits, nature 



of, 330-41 

 Genetical combination, 31 

 Genetics and cytology of Saccharomyces, 



256-66 

 Genie inheritance, 266 

 Genome components, effect on hybrid 



vigor, 482 

 Genome contributions to hybrid vigor, 



484-88 

 Genotype-to-background relationship, 104 

 Genotypes, 219, 336, 344, 425 

 Genotypes of inbred races for viable, lethal, 



and recessive visible alleles, 481 

 Germ plasm, inbreeding effect on, 454 

 Glutamic dehydrogenase, 110 

 Golden Queen Dent, 131 

 Gourdseed Dents, explanation of name, 129 

 Governing genes, 428 

 Graphic transformations to remove epista- 



sis, 465 

 Growth affected by deficiencies for essential 



metabolites, 116 



Growth curves of heterocaryons, 211 

 Growth of heterotic hybrid, determination, 



123 

 Growth-limitation, 114 



Growth in plants 

 abnormal, 118 

 modifying amount and nature, 117 



Growth rates of dwarf races, 121 

 Growth rates of hybrids, 105 

 Growth requirements for hybrids, 121 

 Growth responses with thiamin, pyridoxine, 

 and niacin, 109 



Guatemalan flints, 127 



Gymnosperms 

 female gametophyte in, 83 

 fertilization in, 83 

 mature ovules of, 83 

 seed in, 82-85 

 seed coat in, 83 

 seed development in, 81 



Gymnosperm ovule, 83 



Haploid, 389 



Haploid organism, 199, 389 



Haploid sporophytes, 389 



Hemizygote, 226 



Heritabilities, 350 



Heritability, 161, 174, 460 

 estimates of, 335-37, 352-70 

 for individual components, 335 

 for total performance, 335 



Heritability and gain, 170-71 



Heritability of specific combinability, 451 



Heritable variance, 168 



Heterocaryon formation, 200 



Heterocaryons 



characteristics of, 199-202 



controlled production, 200 



growth curves of, 211, 216 



heterosis in, 202 



model, 210-12 



between sulfonamide-requiring mutant 

 and its double mutants, 212 



vigor in, 120-23 

 Heterocaryons of Neurospora, 110, 199- 



217 

 Heterocaryosis in Neurospora, 120 

 Heterocaryotic suppression of sulfonamide- 

 requiring character, 203-7 

 Heterocaryotic vigor, 202 

 Heterochromatic knobs, 136 

 Heterochromatin, 80 

 Heteromorphic chromosomes, 79 



Heterosis, 14-48, 282, 425, 454 



of American Corn Belt dents, 138-46 

 amount, 31 

 applicability, 217 



