592 



Subject Index 



Radish-cabbage hybrid, 459 

 Radium, mutations and, 241, 243, 

 244, 245, 248, 268 

 reciprocal translocations and, 203 

 Range, 362 

 Raphanobrassica, 459 

 Ratios, 1 : I, 84, 85, 135, 165, 421 



1:1:1, 132, 133, 172 



2 : 1, 83, 84, 86, 87, 128, 406, 537 

 4:1, 448, 462 

 4:6:4:1, 332, 342 

 6 : 15 : 20 : 15 : 6 : 1, 342 

 8 : 18 : 8 : 1, 462 

 1,422 



1 : 1, 161, 162, 186, 322 

 1, 83, 84, 128, 135, 161, 319, 320 



3 : 1 : 1, 158 

 1, 421, 422, 449 

 3:3: 1, 127, 128, 129, 130, 136, 



157, 163, 320 

 3 : 4, 323, 324, S29 

 6 : 1, 331 



7, 326, 327, 328, 329 

 : 3 : 1, 321, 329 

 : 3, 326, 327 

 : 1, 330 ff., 460, 461 

 : 9 : 9 : 9 : 3 : 3 : 3 : 1, iS7 

 : 31, 335 

 : 1, 449, 462 

 : 1, 335 

 : 175, 335 

 1, 335 



Ratios, genetic, and nondisjunction, 

 425, 426 

 in allopolyploids, 460 

 in autotetraploids, 448, 462 

 in trisomies, 421, 4^2 

 Recessive genes, 19, 20, 105 

 Reciprocal cross, 88, 89, 96, 130, 134, 



152, 273, 276, 277 

 Reciprocal translocation, 203, 204, 

 205, 264, 403, 423, 425, 532, 

 533 

 and chromosome circles, 406, 407, 



408, 409, 427, 428, 429, 534 

 and nondisjunction, 425, 427, 428, 



429 

 and X-rays, 404 



9 : 

 9 : 

 9 : 



12 : 



13 : 

 15 : 

 27 : 

 27 : 

 35 : 

 63 : 

 81 : 

 255 



Reciprocal translocation (continued) 

 configurations at first meiotic 



metaphase, 406, 407, 408, 409 

 pairing at meiosis in, 404, 405, 



406, 407 

 Recombinations of genes, 149 ff ., 150, 



171 ff., 206, 226 

 Reduction division, 49, 65, 72 

 Relational coils, 55, 56 

 Relative growth, 315, 316 

 Relic coils, 15, 53, 75, 393 

 Repeat, 395 

 Reproduction, asexual, 47, 66, 513, 



514 

 sexual, 47-52, 68 ff., 480 ff., 513 

 vegetative, 66. 141, 142, 235, 374, 



441, 453, 513 

 Repulsion, 154, 155, 156, 157, 158, 



161, 162, 166, 178 

 Rhesus blood types, 289, 291 ff., 294, 



295, 296, 297, 298 

 Rhoeo discolor, 405, 406, 472 

 Ring chromosomes, 393, 394, 395, 



396 

 Rosa, 468 



Riidbeckia hirta, 328, 329, 330 

 Rumex, 73, 505, 506 

 Rye, haploids in, 437 



number of chromosomes in, 11 

 R3'e-barley hybrids, sterility of, 444, 



445 

 Rye-wheat hybrids, 459, 460 



Salamanders, 442, 472 

 Salivary gland chromosome map, 

 compared with genetic and 

 metaphase maps, 192 

 construction of, 193, 194 

 Salivary gland chromosomes, 74-78, 

 192, 193, 194, 251, 397 

 and bar locus, 209, 210 

 euchromatin and heterochromatin 



in, 220, 224 

 pairing in if heterozygous for an 

 inversion, 398 

 Sample, 121, 359, 363 

 Satellite, 10 

 Sciara, 78, 488, 489, 490, 491, 492 



