SUBJECT INDEX 



375 



Sexual polymorphism, 249 

 Shape, hereditary control of, 217 

 Siamese cats, 258 

 Silkworm, 53, 77, 115, US, 127, 



206-207, 251, 280 

 Size, different, transplantation of 



organs between animals of, 220 

 hereditary, 193, 213, 217 

 Snails, dextral and sinistral, 277 

 Somatic crossing over, 176 

 Somatic mutations, 176, 225, 201 

 Somatic segregation, mosaic spots 



by, 176 

 Species hybrids of Lepidoptera, 189 

 Spilosoma lubricipeda, 250 

 Step allelomorphism, 295, 299 

 Stereoisomers, 310 

 Stratification, 205, 220, 240, 252, 



256, 262, 266 

 Symmetry, 221 



Teleost crosses, 49 



Temperature action, 4-5, 12, 22, 46, 



75, 139, 233, 312 

 Tenebrio, 113, 173 

 Tetraploidy, 147, 150 

 Tetrasomics, 147 

 Thais polyxenn, 242 

 Thermophenes, 104, 143 

 Threshold effect, 12, 65, 71, 89, 115, 



117, 120, 123, 127-128, 135, 150, 



163, 180, 188, 190, 219, 223, 297 

 Tiger stripes, 257 

 Tobacco, 112, 278 

 Tomato, 212, 218 

 Translocation, 137, 145, 307, 313 

 Transplantation of organs between 



animals of different hereditary 



size, 220 

 Triploidy, 124, 147, 149 

 Trisomies, 147, 213 



Triticum, 38 



Triton (Triturus), 179-180, 268 



Trophochromatin, 264 



Tumor, hereditary, 271 

 Tumors, melanotic, in fish hybrids, 

 44 



U 



Unequal crossing over, 304 

 Unstable genes, 175 



Van't Hoff formula, 44 

 Vanessa ichnusa, 4 

 Vanessa levana-prorsa, 249 

 Vanessa polaris, 4 

 Vanessa urticae, 4, 6-7 

 Variegation, 289 



in ferns, 291 

 Variegation, Nicotiana, 292 

 Vertebral ankylosis, 25 

 Vertebral column, hereditary abnor- 

 malities of, 78 

 Vertebrates, monstrosities in, 81 

 Vicia faba, 272 



W 



Wasp patterns, 257 

 Wave mechanics, 288 

 Wheat, development of ear form in, 

 38 



Y-chromosome, 279 

 Z 



Zebra stripes, 257 



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