INDEX 



345 



Extension gene, 157 

 External factors, 261, 275 

 Extracted recessives, 310 

 Extra chromosomes, 229 



toes in poultry, 50, 171 

 Eye color, 17, 20, 53, 102, 170, 

 195, 235, 305 



Factor hypothesis, 148 



endocrine, 261 



environmental, 254 



external, 261 



modifying, 297 



mutation, 58, 60 

 Falling in love, 326 

 False reversion, 197 

 FARRABEE, 102 

 FAY, 306 

 Feathers, 50 

 Fecundity, 137 



Feeble-mindedness, 197, 302, 

 303, 309, 311, 316, 320, 321, 

 322, 325 



Feet of Chinese women, 75 

 Feral animals, 198 

 Fertilization, 224, 225, 226, 268 



abnormal, 230 



self, 97, 134 



Fertilized eggs, 55, 58, 223 

 Fever, Texas, 82 

 Fibers, mantle, 220 

 Filial generation, 103 

 FISH, 118, 145 

 Fission, 10, 11, 87 

 Fission rate, 136, 137 

 Flatworms, 293 

 Flavism, 199 

 Fluctuation, 42, 129 

 Four-leaved clover, 20 

 Four-o'-clock, 106, 169, 174 

 Fowls, 89, 171, 289 



blue Andalusian, 169, 174 



jungle, 60, 196 



rumpless, 172 

 FRANKLIN, 322 

 Freaks, 51 

 Free martin, 288 

 Frequency polygon, 29 

 Frog's eggs, 259 

 FEUWIRTH, 136 



GAGE, 71 



GALTON, 23, 24, 65, 93, 94, 121, 

 122, 130, 155, 199, 302, 318 



Laboratory of Eugenics 318 

 Gametes, 223 

 Gametic mutation, 53 

 Gametogenesis, 254 

 Garlic, 136 

 GATES, 46, 59 

 Gelastocoris, 269 

 Gemmules, 11, 73 

 Generation, filial, 103 



parental, 103 



spontaneous, 9 

 Gene, 149 



allelomorphic, 149 



alternative, 149, 150, 10 



arrangement of, 245 



color, 152, 161 



complementary, 149, 150, 151 



constant, 160 



cumulative, 149, 150 



diluting, 156 



duplicate, 190 



extension, 157 



kinds of, 149 



lethal, 149, 151, 162 



localization of, 246 



intensifying, 156 



modifying, 146, 149, 150 



pattern, 154, 161 



pigment, 152 



plural, 149 



restriction, 156 



sex, 269 



single, 149 



supplementary, 149, 151, 154 



uniformity, 155 

 Genetics, 3 

 Genius, 305, 316 

 Genotypes, 105, 110, 111, 113, 



116, 196, 250 



Genotypic selection, 200, 213 

 Gemmules, 11, 73 

 Germ-cells, 221 



Germplasm, 12, 14, 16, 72, 113, 

 196, 254, 315 



architecture of, 233 



continuity of, 13, 14, 251 



conservation of, 330 



