66o 



INDEX 



HEXAPLOID, 62, 184, 187 

 Hieracium, 438 et sqq. 



apomixis, 473 



fragment, 145 

 Hollingshead, 44, 62 

 HOMOLOGY, 328, 567 



change of, 115, 199, 499 



and terminalisation, 510, 311 



and pairing, 164 

 Homoptera, 368 

 HOMOZYGOTE, CEnoihera, 342 

 Hordeum, 421 

 Hosia, 523, 524 

 Humulns, 358 et sqq. 

 Hyacinthus, IV 



abnormal pollen, 396 



chiasmata, 127, 128 



chromosome size, Sz, 83 



clones, 3ig 



mitotic chromosomes, 37 



polyploid meiosis, 119 



triploid, 216 

 pollen, 318 



unbalance, 325 

 HYBRID, classification, 137 



complex, 138 



fertility of, i8y et sqq., 196 



intersexual, 384 



at mitosis, 44, 45 



numerical, 137 



permanent, 335 



pollen grains of, 195 



polyploid, 138, 183 et sqq., 208 

 et sqq. 



structural, see structural hybrid. 



in systematics, 135 



twin, 339 



undefined, 137, 168 et sqq. 

 See also heterozygote. 

 hybridisation, 17 

 hybridity, and apomixis, 440, 467, 472 



coefficient, 271 



equilibrium, 271 



and non-reduction, 297 



of old clones, 421 

 hydration, of nucleus, 544 



of spindle, 520 

 hydrogen ion concentration, 32, 547, 



561 

 Hymenoptera, polyploid cells, 63 



salivary glands, 175 



segregation, 248 

 Hypericum, j6o, 338 

 hypothesis, see theory, 

 hysteresis (lag), 483. 550 



Iberis, 235 



Icerya. 6. 24, 311, 397, 449 



sex, 377 

 Iguanidae, 63 

 Impatiens, 405 

 inbreeding, 279, 378 

 incompatibility, 12, 17 

 inertness, see chromosome, gene, 

 inference, of crossing-over, 249, 298 



of forces, 482 et sqq. 



of movement of chromosomes, 

 503 et sqq. 

 infra-red photography, 570 

 Infusoria, 50 



insertion-region, see centromere. 

 INTERCHANGE, 69, 124, 555 et 

 sqq. 



and chromosome form, 59 



heterozygote, 149, 150, 263, 286 

 et sqq., VI 



internal, 156 



(Enothera, 342 



sex chromosomes, 360 



time of, 71 



Zea Mays, 282, 304 

 INTERFERENCE, between 

 chiasmata, 292 



between chromosomes, 293, 551 



between crossings-over, 252, 287, 

 292 



chromatid, 292, 551 



at zygotene, 165 

 interlocking, at meiosis, 156, 255 



at mitosis, 74, 502 

 INTERPHASE, 117, 118, 487 

 intersex, 384 



interstitial chiasma, see chiasma, 

 interstitial segment, 263 

 INVERSION, 69, 554 et sqq. 



crossing-over in heterozygote, 265 

 et sqq. 



and the gene, 333 



heterozygote, 152, IX 



reversal, 280 



salivary glands, 180, 181 

 irradiation, see X-ray. 

 iso-electric point, 315, 561 

 ISOGAMY, 18 

 Ixeris, 438, 454 



Jamaicana, 140 

 Janssens, 250, 253, 573 

 Johannsen, 245, 576 

 Jargensen, 195, 442 



