646 



SUBJECT INDEX 



Tumors — continued 

 transplanted 



antigenic simplification of, 425 



Barrett-Deringer change in, 426 



chromosomal changes in, 433 



crossing over in, 433 



genetic and epigenetic mechanisms in, 



432 

 point mutations in, 432 

 uterine, in rabbits, 254 

 viral, 461 



and infective heredity, 446 

 viruses 



cytocidal, 447 

 in relation to, 265 

 Tumor-specific antigens, 460 

 Turbidimetric estimates of natural melanin 



content, 338 

 Turner's syndrome, 416 

 Twinning in cattle, 273 



rank order and, 273 

 Types of interaction, 179 

 Types of mating useful in determining linkage, 



56 

 Typhoid, murine, 384 

 Tyrosinase, 164, 189 



activity, analysis of variance, 339 

 color factors and activity of, 170 

 molecule, 218 

 Tyrosine, radioactive, 342 



Ultracentrifugation, 309 

 Univalent 



antibodies, 349 



antigens, 349 

 Unsquashed preparations of chromosomes, 



491 

 Uranium, 128, 235 



Urethan, pulmonary tumors induced by, 255 

 Urinary tract, anomalies of, 238 

 Uterine 



carrier for teratogens, 241 



tumors in rabbits, 254 



Van Allen belt, 129 

 Variance 



additive, 198 



analysis of, for tyrosinase activity, 339 



environmental, 195 



genetic, 185 



in litter size in mice, 208 



nonadditive, 198 



phenotypic, 198, 216 

 Variants 



analysis of, 291 



Variants — continued 



assignment of, to genetic and environmental 

 components, 291 



drug-resistant, of cells in culture, 462 



isoantigenic, from F 2 tumors, 434 

 Variation, 195 



in barking, 286 



in karyotype, 508 



isoantigenic, 460 



quantitative, degree of genetic, 216 



quasicontinuous, 241, 247 



relationship between genetic and behavioral, 

 285 



somatic, 423, 467, 468 



studies through phenotypic marker, 410 

 Variation-selection mechanism, 461 

 Variegation in maize, 422 

 Vector 



host, 403 



of mating-type frequency, 8 

 Vendors of equipment useful in care of mice, 



556 

 Viability following radiation, 144 

 Vincaleukoblastine 



and mitotic arrest, 475 



and preparation of chromosomes, 475 

 Viral 



hypothesis of oncogenesis, 268 



tumors and infective heredity, 446 



tumors, 461 

 Viruses 



relation to etiology of tumors, 265 



susceptibility of arthropods to, 402 



tumor, cytocidal interaction, 447 

 Visible mutations, 136 



dominant, 140 



recessive, 141 



wabbler-lethal mice, 219 



Washing machinery for sanitizing equipment, 



553 

 Watering devices for mice, 550 

 Weight, correlation of, with size of litter in 



guinea pigs, 281 

 White spotting, 330 



X factor, 437 



X irradiation, 128 



and somatic mutations, 419 



polydactylism, 190 



relationship to resistance mechanisms, 396 



therapy, 128 



Zone electrophoresis, 302 



Zygote diagram of brother-sister mating, 44 



