664 



INDEX 



Mendelism in domestic animals, 465 

 mathematical adequacy of. 77 

 operation of, 68 

 physical basis of, 57 

 principle discovered by Naudin, 430 

 rapid development of, 71 

 Mendelizing characters, due to factor mutations, 



286 



in domestic fowls, 477 

 Mercer and Hall, experimental error, 430 

 Meristio variations, 16 

 Mespilus-Cratsegus graft-hybrids, 378 



germanica, 378 

 Metabolic theories of sex, 544 

 Method of comparing yields, 356 



of cytology in genetic research, 8 

 of experimental breeding, 6 



morphology, 10 

 of hybridization, general, 343 

 of observation in genetic research, 4 

 of producing hybrid seed corn, 361 

 Methods of breeding animals, 577 

 of breeding investigations, 591 

 of creating new varieties of plants, 302 

 of dealing with genetic data, 95 

 of pedigree culture, 419 

 of planting, 420 

 of protection, 420 



of recording and preserving data, 422 

 of seedage, 419 



of testing Mendelian ratios, 100 

 Metz, Drosophila, 263 

 Meyer, seed and plant introduction, 299 

 Meyer and Schmidt, stock and scion, 384 

 Mice, affected by temperature changes, 491 

 disease in, 527, 529 

 effects of alcohol on, 493 

 four-fold factor segregation in, 94 

 multiple allelomorphs in, 155, 160, 225 

 Miles, factor variability, 134 

 Milk, efficiency, 503 



production records, 445, 455, 591 

 Milo, resistant to smut, 416 

 Milward, certified seed, 397 

 Miniature wings in Drosophila, 146, 170 

 Minot, sex-ratio, 542, 543 

 Mirabilis jalapa, intermediate expression in 



heterozygotes, 147 

 vigor in species hybrids, 230 

 Mitosis, 59 



and somatic segregation, 274 

 mechanism of, 274 



Mixed populations, isolation of pure lines, 256 

 Mode defined, 34 



Modifiability and breeding value, 456 

 and correlation, 459 

 and selection, 578 

 and variation, 454 

 in fecundity, 498 



Modification of graft-symbionts, 383 

 Modifications, 15 



functional, inherited? 481, 489, 491 

 not transmissible, 385 

 of phytomeres, 385 



Modifying factors, assumed in hooded rats, 190 



discovered in Drosophila, 192 

 Moenkhaus, Drosophila, fertility, 553 

 Mohler, zebu immunity, 528 

 Molecular configuration and specificity, 266 

 Mongrel dairy cows, 455 



ponies, 567 



Monoecious plants, 317 

 Monohybrid, 68 



ratio, 71 

 van Mons, plant breeding, 437 



systematic breeding, 288 

 Montgomery, E. G., experimental error, 430, 431 



wheat, 432, 433, 434 



Montgomery, T. H., chromosomes in man, 538 

 Morgan, abnormal abdomen in Drosophila, 26, 

 134 



crossing-over, unit of, 117 



dominant mutant factor, 149 



effects of ether on Drosophila, 74 



eye color in Drosophila, 194 



factor group, determination, 115 

 relations, 575 



factors, lethal, 132 



manifold effects of, 133, 134 

 similar effect of, 141 



gynondromorphism, 269 



heredity, factor conception of, llo 



hickory phylloxeran, 211 



lethal factor, 547 



linkage, 110, 116 



Mendelism, 68 



multiple allelomorphism, 155, 160 



presence and absence hypothesis, 155 



sex-ratio, 540 



sterility, 554 



three-point experiment, 118 



white eyes in Drosophila, 74 



WZ type of sex-inheritance, 205 



XY type of sex-inheritance, 196 

 Morgan and Bridges, crossing-over, 113 



data, three-point experiment, 118 



Drosophila mutation, 555 



three-point experiment, 123 

 Morphological variations, 16, 17 

 Morrow and Gardener, increased yield from 



hybrids, 354 

 Morse, sweet pea, 208 

 Morton, quagga hybrid, 565 

 Mosaic expression of the hybrid character, 



152 



Mosquito, yellow fever, 528 

 Moths, grafted, 382 



intersexes in, 216, 217 



sex-inheritance in, 205, 209 

 Mule, breeding industry, 516 



chromosomes in, 559 



Equus caballus X E. asinus, 228 



fertility of, 518 



reduction divisions in, 558 



sterility of, 556 



Mullein thrips, see Anthotrips verbasoi. 

 Muller, crossing-over, double, 124 

 factors for, 120 



