344 



R matrix, 304 

 Race, 252 

 Radish, 190 

 Rain forest, 84 

 Rana, 218 



catesbiana, 216 



pipiens, 215-218, 234, 300 



sylvatica, 216, 217 

 Random fixation and loss of genes, 97-101, 



121, 235 

 Random mating, 91, 170 

 Random segregation, 34 

 Raphanohrassica, 190, 191 

 Rates of evolution, 260-264, 266, 267 

 Rats, 85 



Raven, 180-182 

 Recapitulation, 66, 67 

 Recessive, 40 

 Reciprocal translocation, 47, 49, 50, 177, 



180, 183, 184, 186 

 Recombination, 13, 35, 38, 40, 46, 79, 162, 

 163, 234 



in annual plants, 183 



and environment, 170, 171, 183, 206 



of genomes, 191 



in herbaceous plants, 171, 183 



index of, 183 



length of generation and, 79 



in microorganisms, 164 



in perennial plants, 171, 183 



reduction of, 169 



size of individual and, 79 



in woody plants, 171, 183 

 Recons, 38 

 Redstarts, 128 

 Redwood trees, 58 

 Reindeer moss, 87 

 Religions, 287, 288, 290, 291 

 Rehgious belief, origins of, 288 

 Renner complexes, 182 

 Rensch, R., 274, 277 

 Repressor substances, 65 

 Reptilia, 186, 251, 264, 267, 270 

 Reticulate phylogeny, 299 

 Reticulate variation, 258 

 Rh locus, 146 

 Rhoeo, 111, 180 

 Rhynchocephalia, 251 

 Ribonucleic acid, 14, 15, 17-19, 65 



messenger, 17, 18, 27, 64, 65 



transfer, 18, 27 

 Ring of chromosomes, 50, 182 



Ribosomes, 17, 25 



River model, 1 16 



RNA {see Ribonucleic acid) 



Robins, 128 



Roe, 128n. 



Root grafting, 74 



Rosaceae, 194 



Rotifers, 200, 201, 205, 247 



Riibus, 202, 204 



Ryan, F. J., 55, 207 



Rye grass, perennial, 191 



Saez, 29, 30, 33, 34, 43 



Sagan, C, 21 



Sager, R., 55, 207 



Salamanders, 190, 218, 219 



Salivary gland chromosomes, 47, 49, 140 



Salmonella, 163 



typhimurium, 164 

 Sampling error, 95, 100, 237, 243 

 Scale insects, 74 

 Scallions, 191 

 Scarlet tiger moth, 131 

 Schmieder, 30 In. 

 Sciara, 28, 177 



coprophila, 187-189 

 Scientists, faith of, 312 



responsibility of, 313 

 Scorpions, 178 

 Sedges, 266 

 Sedlmair, 159 



Segmental allopolyploidy, 191, 195 

 Segregational load, 113 

 SelecUon, 45, 46, 48, 64, 93, 102, 117, 118, 

 230, 237 



artificial, 103, 150 



coefficient of, 105 



creative aspect of, 102-104 



directional, 104, 127 



disruptive, 104, 147, 148, 248 



interclone, 248 



intergroup, 122 



intragroup, 122 



natural, 13, 42, 60, 86, 103, 150 

 cultural analogue of, 291 



plateau in response to, 152 



pressures, change of, 289 



relaxation of, 152, 153 



stabilizing, 104, 125, 153 

 Self-fertilization, 170, 206 

 Self-poUination, 183 



