INDEX 



rabies, 210 

 Race, R. R., 333 

 race theory, 353 

 Raphano-brassica, 135, 231, 232 

 rat, 202 



ratio, mendelian, 37, 156 

 recessive characters, 347 

 reciprocal crosses, 48, 125, 126 

 recombination, 33, 41 sqq., 117, 132, 237, 

 304 sqq. 



and correlated response, 297 



and natural selection, 290 

 reduction, 33 



reductional separation, 31, 52 

 regeneration, 173, 189 

 regression coefficient, 61 

 Rendel, 272 

 Renner, 170, 201, 260 



effect, 201, 268, 272, 311, 342 

 reproduction, v. sexual 



V. self-propagation 

 Rhesus blood-groups, 333 

 Rhoeo, 130, 317 

 Rick, 99, 242 

 ring-formation, 129 



breakdown of, 263 

 Rischkov, 208 

 Risley, 354 

 rodents, 157 

 rogue, 182 



See also mutant 

 root-cutting, iii 

 Rosanoff, 349 

 Rous, 213 

 Rudbeckia, 159 

 rye, 237, 260, 297 



Saccharomyccs, 179 



Salaman, 218 



salivary gland, v. polytene 



Sax, 72, 206 



scales, 58, 78 sqq. 



tests of, 79 

 Schnarf, 201 

 Schrodinger, 371 

 Sciara, 193, 252 

 Scilla, igj 



Scolopendrium, 186, 190, 327 

 sea urchin, v. echinoderni 

 Secale, v. rye 

 segregation, 38, 45, 68, 127, 237 



somatic, 187 

 Seiler, 264 

 selection, 272 sqq., 302 



correlated response to, 298 



selection — continued 



discriminative action of, 294 

 self-fcrtUization, 36 



diploid, 240 



haploid, 240 

 self-propagation, 28, 149, 203 

 serology, v. blood group 

 sex-chromosomes (X and Y), 46 sqq. 

 sex determination, 46 sqq., 166, 193, 204, 



256, 339 ^I'J-, 346 

 sexes, homogametic and heterogametic, 



49. 229 

 sex-linkage, 48 sqq. 



partial, 50, 346 

 sex-ratio, 275, 337 



super-gene, 336, 337 

 sexual differentiation, v. dioecy 

 sexual reproduction, 16, 24, 29, 99 



breakdown of, 268 

 shibboleth, 360 

 Sismanidis, 285, 297 

 Smith, K. M., 209 

 snail, 191 

 Solanum, iii, 228 

 Somiebom, 175 

 Sorghum, 104, 151, 195 

 sparrows, 282 

 species crosses, 135, 191 

 speech, 360 

 speltoid, p. w^heat 

 sperm, 24, 28, 51, 105, 216 

 spermathecae, 298 

 spider, 52 

 Spiegelman, 179 

 spindle, 23 

 spiraUzation, 146 

 spore, 29, 32, 44 

 sporophyte, 29 

 sport, p. mutation 

 standard deviation, 59 

 sterility, p. fertility 



genotypic, 231 



hybrid, 235 



male, 174, 190 



segregational, 232 

 Stem, C, 161 

 Stem, F. C, 322 

 Stizolobium, 134 

 strawberry, 218 

 Streptocarptis, 228, 253 

 structural change, 100 sqq. 

 structural hybrid, 122 

 Sturtevant, 132, 313 

 subsexual reproduction, 266 

 sugar beet, 237 



445 



