546 



INDEX 



Intra-breed linecrosses, comparison with 



representative purebreds, 353 

 Introgression, 419, 421 



of genes, 422 



teosinte X maize, 185 

 Inversion, 77, 222 

 Iron in hybrids, 106 

 Irregular Mendelian segregation, 259 

 Iterative crosses, 40, 42 



"Junk" inbred, importance of, 139 



Kalanchoe plants, 117 



Kinetic theory of position effect, 78 



Knob number, 129 



Knobbed chromosomes, 75 



Knob less chromosome 9, 70 



Kynurenine, 238 



Lancaster Surecrop, 140 

 Leaming Dent, 17 



Leaves and stems of hybrid plants, analyses 



of starch content, 108 

 Lethal genes, 229, 476 

 Lethals, incompletely recessive, 289 

 Linear heterogeneity, 265 



Linearity of inbreeding depression and 

 heterozygosity, 459-60 



Line cross tests, selection for general com- 

 bining ability, maternal ability, and 

 specific ability, 364-68 



Lines selfed once versus lines selfed more 

 than once in hybrid formation, 444-48 



Linkage, 327, 402 

 effect of, 501 



and gene recombination, 314 

 and heterosis, 285 

 multiple factor, 130 

 role of, 502-3 



Linkage and marker genes in barley, 298- 

 302 



Linkage and pleiotropy, 317-18 



Linkage relations, 314-17 



Linkage systems, 139 



Locus, heterotic, 328 



Luxuriance, 22-23, 224, 291, 296 



Main and component characters of to- 

 matoes, 305-10 



Maize 



archaeology, 175, 185 



backcrossing in, 235 



breeding, importance of character com- 

 plexes, 131 



chlorophyll production in, 228-29 



chromosomes, 185-87 



chromosomes, localized centromeres of, 

 77 



cross- and self-fertilization in, 49 



heterosis in, 53 



history, 176 



hybrid vigor in, 142 



hybridization, 9 



hybridization in evolution of, 197-98 



interbreeding and cross breeding, 12 



interracial hybridization in, 176-83 



introgression with teosinte, 185 



male inflorescence of, 133 



Mexican races, origin of, 176-80 



monoploids in, 389-99 



plants, comparison of fertility and steril- 

 ity, 234 



pod corn, 175, 176 



pop corn, 175, 176 



preferential segregation in, 66-80 



races, 148 



races, crossed, 177, 178, 182 



and teosinte hybridization, effects of 

 186-87 



and teosinte hybrids, 183-84 



and teosinte interspecific hybridization, 

 183-97 



and Tripsacum, relation between, 138 



white dent, 29, 35, 38 



Male inflorescence of maize, modification 

 by condensation, 133 



Malic dehydrogenase, 110 



Manifold effects, 350 



Marker genes and linkage in barley, 298-302 



Mass matings, 257 



Maternal ability, 352 



Maternal effects, 352, 499-500 



Maternal monoploids, 393 



"Mating systems," 152 



Mating types of spores, 257 



Maximum yields from crossing high by low 



combinations, 465-66 

 Mechanical picking, breeding for, 146 



Mechanisms which promote hybridity, 152- 

 54 



Megasporogenesis, 79 



occurrence of preferential segregation, 66, 

 68 



Meiosis, 390 



diploid behavior at, 500 



mechanics of, in maize monoploids, 393 



Meiotic divisions, 72 

 Mendelian ratios, 11 

 Mendelian sampling, 353, 365 

 Mendelian segregation, 19 

 irregular, 259 



Mendelian theory, direct tests of, 259 

 Mendel's first law, 70 

 Mendel's Laws, rediscovery of, 49 

 Mendel's laws of segregation and recom- 

 bination, 66 



