INDEX 



369 



East, E. M., 178, 229, 302, 314 

 Echinoderm hybrids, 266-272 

 Egg, 6; chromosomes of, 38 

 Elimination of chromosomes in hy- 

 brids, 267-276 

 Emerson, R. A., 229, 245, 265 

 Emotional characteristics, 263 

 Environment, 4; in sex determina- 

 tion, 79, 82; relation of character- 

 istics to, 232-265; interaction with 

 heredity, 232-265; internal, 233- 

 239; inherited characters affected 

 by, 241-252; diverse role in dif- 

 ferent characters, 252-254; in iden- 

 tical twins, 258-264 

 Evans, H. M., 81 

 Evening primrose, 319, 322, 324, 325, 



336 _ 

 Evolution, progressive, 363 

 Exchange of parts of chromosomes, 



139-151, 336; ratios, 141-151 

 Eyster, W. H., 365 



Facets of insect eye, 247-249 

 Factor, definition, 207 

 Family relationships, 299-301 

 Federley, H., 275, 281 

 Feeblemindedness, 193 

 Fertilization, chromosomes in, 17 

 Fertilized egg, chromosomes of, 38 

 Fish, sex ratios, 76 ; hermaphroditism, 



80; secondary sex characters, 126- 



128; inheritance through Y, 126- 



128, 218 

 Fowl, 96, 224 



Fraternal twins, 200, 254, 258, 262 

 Free martin, 73, 82 

 Frog, 235 

 Fruit-fly, chromosomes, 20; figure, 24 



{see Drosophila) 

 Fukuoka, G., 257, 265 

 Fundulus, chromosomal vesicles, 42; 



hybrid, 44, 273, 276-278 



Gabritschevsky, E., 265 



Gametes, 51, 53; relation to linkage, 

 169-170 



Gametogenesis, 53 



Gates, R. R., 103, 339 



Genes, 131, 138-163; proof of exist- 

 ence, 142 ; arrangement in series, 

 146-158; diagram, 157; visibility, 

 158-159; maps, 159-160; locus, 160; 

 designations, 166; functional group- 

 ing, 174-177; relation to character- 

 istics, 179-205, 286 ; special and gen- 

 eral effects, 179-181; method of 



action, 181 ; two types of diversities, 

 182; interaction of genes, 182-185; 

 multiple and duplicate genes, 185- 

 186; action in development, 187, 

 233-239; loss of genes, 189; time of 

 action in development, 192; produc- 

 tion of new combinations, 283-286; 

 distribution, 284-286; effect of 

 chromosome breakage, 333-336; 

 mutation, 340-365 {see mutation) ; 

 inactivation, 356-359 



Genetics, subject matter, 1, 3, 4; def- 

 inition, 3 



Genetic system, 37; history in de- 

 velopment, 38-51; operation in 

 relation to sex, 55-82; what it in- 

 cludes, 165; relation to characteris- 

 tics, 83-103 ; functioning as a whole, 

 164-178; general relations in its 

 operation, 283-314 



Genetic variations, 288, 315-365; 

 types, 315-316 



Genital cells, 69 



Genotype, 111 



Germ cells, 6-11, 15, 16; production, 

 45-53; in hybrids, 273-276 



Germ gland, 69; role in sex develop- 

 ment, 71-74 



Giants, in Drosophila, 244 



Godlewski, E., 281 



Goldschmidt, R. B., 76, 81, 82, 348, 

 364 



Gould, H. N., 82 



Gower's disease, 98 



Gynandromorphs, 77, 78, 82 



Haemophilia, 85, 89, 90, 98 

 Haploids, 39, 53, 321, 323 

 Hayes, H. K., 229, 302, 314 

 Herbst, C, 269, 271, 272, 281 

 Heredity, definition, 4, 164; materials 



of, see Materials. See Inheritance 

 Hermaphrodites, 80 

 Heterogametic, 54 

 Heterosis, 292 

 Heterozygotes, 111-113 

 Hirsch, N. D. M., 205 

 Hoge, M. A., 243, 265 

 Homozygotes, 110-113, 287, 300, 312- 



314 

 Horlacher, W. R., 360, 365 

 Hormones, 74, 235-239 

 Horns, inheritance, 125, 129 

 Hurst, C. C, 338 

 Hybridization, 266-282 

 Hybrids, chromosomes in, 44, 267- 



276; between very diverse or- 



