INDEX 



653 



Chromosome, mechanism, 57, 59, 01, 65, 105 

 number and breeding, 342 

 and selection, 257 

 and specification, 263 

 in horse and ass, 519, 537 

 relations in sex-inheritance, 196, 205 

 theory of heredity and linkage, 104, 117 

 Chromosomes, 57, 58, 59 



aggregates of chromatic material, 59 



and fertility, 555 



behavior in non-disjunction, 199 



combinations of, in germ cells, 64, 5 



deviations in number, 263 



diploid and haploid numbers, 65, 66 



independent distribution of, 63 



individuality of, 59 



in graft-hybrids, 374 



in male and female honey bees, 210 



in related forms, 264 



interchange of chromatin between, 63, 65, 67 



maternal and paternal, 60, 64, 65 



number in Abraxas, 208 



in Drosophila, maize, wheat, man and 



tobacco, 57, 184 

 in Nicotiana, 184 

 in wheat and rye, 238 

 occurrence in pairs, 58 

 phylogeny of, 264 



Chrysanthemum, bud sports in, 398 

 collections, 299 

 species and varieties, 302 

 Citrous fruits, chimeras, 381 

 bud selection, 391 

 undesirable sports, 391 

 Citrullus vulgaris, 414 

 Citrus breeding, 297, 300 

 bud mutations in, 392 

 chimeras, 375, 378, 381 

 collection, 300 

 group, research on, 300 

 pollen, 300 



Clark, Ghirka wheat, 372 

 Classifications of variations, 15 

 Clonal diversity, 302 



multiplication, 296, 311 

 selection, 291, 293 

 selections, propagation, 298 

 variation, 391 

 Clone, 257 



propagation of, 298 



Close-pollinated plants, selection in, 336 

 Clover, at Svalof, 293 

 red, 317 



remnant system, 335 

 Club wings in Drosophila, 134, 135 

 Cockerell, red sunflower, 270 

 Coefficient of correlation, 52 



as index of inheritance, 459 

 calculation of, 53 

 interpretation of, 54 

 of inbreeding, 598 

 of relationship, 600 

 of variability, 44 

 in Ft families, 185 



Coffee, dimorphic branches, 275 

 Coit, Hizarria, 378 



orange chimeras, 375 



"recorded" stock, 394 



undesirable sports, 391 



Washington navel orange, 392 

 Cole, Clydesdale, 467 



record sheet, 603, 005 



reversion in pigeons, 172 

 < ''ili-ui, blumei, 389 



bud mutations, 388. 390 

 selection in, 386, 389, 390 

 sports, 386 



color patterns, 387 



composite crossing in, 386 



fluctuating variation, 386, 300 



history of garden, 386, 389 



lacinate-leaved, 386, 389 



pedigree method, 390 



pigmentation, 389 



seed progeny, 389 



somatic factor mutations, 388 

 Collections of plant-breeding material, 299 

 Collings, breeder, 501 

 Collins, comparing yields, 356, 357 



corn, purple X white, 105, 358 



increase in yield by hybrids, 354, 359 



narrow breeding, 334 



seed corn production, 361 



Collins and Kempton, effects of crossing, 360, 361 

 Color-blindness in man, 197 



-chimeras, 381 



Comb characters in fowls, 164 

 Combinations, 15, 99 



of factors in crossing-over, 108 



of gametes in Mendelian experiments, 100 



sesqui-hybrid, 235, 237, 244, 248 

 Commelin, sweet pea, 303 

 Cook, cotton, 295 



dimorphic branches and leaves, 275, 276 



"new creations," 440, 441 

 Cooper, plant breeding, 437 



selection, value of, 288 

 Complementary factors, 140 

 Composite crossing, fruits and flowers, 297 



grains, 296 



in Coleus, 386 



roses, 311 

 Composition of plant populations, 317, 321 



of self-fertilised populations, 320 

 Concept of factor mutation, 267 



of reaction system relations, 238, 242, 248 

 Contabescence, factor for, in sweet peas, 234 

 Contagious abortion in cattle, 552 

 Contamination, allelomorphic, assumed, 192 



of factor, hypothesis of, 190 

 Continuous variations, 18 

 Cooperative breeding, 606 

 Corbett, seed impurity, 428 

 Corn, see Maise. 

 Correlation, 49 



and linkage, 127 



and modifiability, 459 



and selection, 49, 506 



