342 



Mutation, 38, 44, 46, 48, 53, 59, 93, 101, 

 102, 114, 117-119, 175,237-291 

 back, 101, 114 

 Mutation rate, 44, 79, 263 

 Mutational load, 113 

 Mutons, 38 

 Mythologies, 290 



Narwhals, 275 

 Natrix, 212, 247 



sipedon, 137, 230 

 Natural selection, 13, 42, 60, 86, 103, 150 



cultural analogue of, 291 

 Navigation in California newts, 79, 81 

 Neanderthal man, 284 

 Needham, A. E., 21 

 Neighborhoods, 116 

 Nemobius fasciatus, 186 

 Neophasia, 254 



menapia, 254 



terlooti, 254 

 Neoteny, 67 



Neo-X chromosomes, 178 

 Neo-Y chromosomes, 178 

 Neurospora, 46 



Newts, CaUfornia, navigation in, 79 

 Nondisjunction, 187 

 Nowinski, 29, 30, 33, 34, 43 

 Nuclear division, 27 

 Nucleic acids, 8, 14 



{See also Deoxyribonucleic acid; Ribonu- 

 cleic acid) 

 Nucleolus, 26, 27 

 Nucleotides, 15-18, 38 

 Nucleus, 25-28 

 Numerical taxonomy, 260, 302, 305, 307, 



312 

 Nuthatches, 128, 229 

 Nymphalis, 256 



antiopa, 256 



californica, 256 



milberti, 256 



polychloros, 256 



urticae, 256 



vau-album, 256 



xanthomelas, 256 



Oak-hickory forests, 87 

 Oaks, 171 

 Oats, wild, 84 



Oenothera, 177-180, 182 



biennis, 179, 182 



erythrosepala, 182 



hookeri, 179, 182 



lamarckiana, 182 

 Oligogenes, 52 

 Onagraceae, 180 

 Onions, 94, 191, 198 

 Oparin, A. I., 6, 13, 21 

 Operator genes, transcription of, 64 

 Operon, 64 

 Opossums, 263 

 Opuntia, 225 

 Orangutans, 283 

 Orchard grass, 146 

 Orchids, 84 

 Oreopithectis, 284 

 Organizers, 63 

 Overdominance, 154 



for fitness, 109, 113 

 Oxidation, biological, 10 



Paeonia, 178, 180 



Pairing segments of chromosomes, 47, 178 



Panmixis, 91, 92 



Papilio dardanus, 147, 149, 246 



glaucus, 212, 232 



laglaizei, 271, 273 

 ParalleUsm, 271 



in cultural evolution, 290 

 Paramecium, 164, 165, 169 

 Parasitism, 229, 245 



Parthenogenesis, 189, 199, 200, 204-206 

 Pasynskii, 21 

 Pattee, 14, 15 

 Pavlovskaya, 21 

 Peacocks, 275 

 Peck order, 80 

 Pedicttlaris dudleyi, 82 

 Pedictdiis, 245 



humanis, 229, 245 

 Peking man, 284, 285 

 Pelecypoda, 261, 262, 264 

 Penetrance, 42 

 Perception, 73 



Pereiuiial plants, recombination in, 171, 183 

 Peromyscus gossypianiis, 300 



leticoptis, 300 

 Phaeophycophyta, 167 

 Phage, 162 



temperate, 163 



