5o8 



SUBJECT INDEX 



neuropore, 253 



Neurospora, 378s, 410 



neurula, 250, 265 



neuruktion, 434, 43 7s, 44i. 448, 455 



node, 169, 205, 240 



nose, 255 



notochord, 262, 447, 449, 45 1 



hypertrophy, 190 



sheath, 262 

 nuclear cytoplasmic ratio, 58 



differentiation, 126, 203, 352, 378 



enzymes, 36, 355 



membrane, 35, 369, 382, 438 



sap, 33, 369 



transplantation, 364, 377 

 nucleic acids, 34, 35, 57, 203, 205, 212, 213, 

 239, 260, 355, 367, 373, 376, 381S, 385 

 nucleolus, 34, 35, 38, 203, 368, 382 

 nurse cells, 5, 37 



oligochaetes, 324 



see Tuhifex 

 oligolecithal, 36 

 onto-mutations, 246 

 oogenesis, 5, 31 

 ooplasms, 16, 106, 146, 238, 402 



chemistry, loi, 114, 238 

 open systems, 407, 409 

 organ-forming areas, 97 

 organ-forming substances, 16, 97, 402 

 organ specificity, 308, 400 

 organisation centre, extent, 177 



metabolism, 200s, 207 



physiology, 193 s 

 organiser, amphibian, 173, 176s 



bird, 182, 248 



infectivity, 179 



labelled, 214 



regionalisation, 178, 180, 215s, 442, 457 



reversal, 452, 458 



secondary, 255 

 ovum, 29 



Paramecium, 359s, 387, 389s, 39^, 40i 

 parthenogenesis, 51, I99 

 pattern, 415s 

 origin, 419, 422, 432, 468 



pattern of manifestation, 342 



pelvis, 276 



periblast, 226, 229, 247 



periodicity, 421s 



Petromyzon, 224s 



pharynx, 257 



phenocopies, 140, 333, 337, 340, 354 



phosphate, 58, 214, 453 



phosphatase, 133, 239 



phylogeny, 8s 



pigment cells, 256, 258, 397, 437, 447, 45^ 



pituitary, 341 



planarians, 304, 306, 317s, 423 



plasmagenes, 55, I35, 387s, 4I2 



Platycnemis, 123s, 132 



pleiotropy, 345 



pluteus, 79 



polar bodies, 33 



lobe, 60, 68, 99 

 polarised light, 66, 438, 439, 443 

 polarity, 150 

 limb buds, 271s 

 organiser, 452, 458 

 regeneration, 322 

 pole cells, 119, 128 

 poles of egg, 6, 33 

 Polydactyly, 429 

 polyploidy, 29, 37, 56, 89, 239, 305, 307, 



352, 354 

 polyspermy, 47, 48, 62, 136, 155 

 polytene nuclei, 353, 355s 

 position effect, 374s, 386 

 potatoes, 392 



potencies, 63, 174, 178, 182 

 prechordal plate, 456, 460 

 presumptive fate, 158, 178 



see : fate maps 

 primitive edge, 245 



streak, 157s, 167s, 237 

 pronephros, 265s 

 prosencephalon, 456 

 prospective value, 158, 178 



see: fate maps 

 protein synthesis, 36, 55, 90, 204s, 212, 

 260, 286, 371, 376, 381S, 400, 409, 412 

 viscosity, 88 

 pupation, 136 

 pseudo-alleles, 375 



