INDEX 



351 



Reduction division, 58, 59 



REEVES, 137 



Regression, 121, 122, 125, 130, 



199 



Regulators, physiological, 262 

 REID, 66 

 Reinfection, 82 

 Relative variability, 28 

 Repair, 9 



Reproduction, sexual, 12, 221 

 Reproductive period, 56 

 Resistance to poisoning, 82 

 Response, 4, 6 

 Restriction gene, 157 

 Retrogressive varieties, 45 

 Reversed dominance, 171 

 Reverse mutation, 53 

 Reversion, 131, 151, 194 



explanation of, 199 



false, 197 

 Rhabdites, 293 

 RHODES, 316 

 Rice, 204 



Ricin immunity, 82 

 RIDDLE, 71, 272, 295 

 RIMPAU, 202 

 Ringer's solution, 89 

 RITZEMA-BOS, 206 

 Roan color, 170 

 Rodents, 171 

 Romans, 208 

 ROOT, 137 

 Roses, 47 

 Rotifers, 274, 275 

 Round worms, 293 

 Rudbeckia, 174 

 Rudimentary wing, 53 

 Rumplessness, 102, 172, 175 

 Rust, immunity to, 102, 296 



Sacculina, 290 

 Salamander, 77, 102 

 Salamandra, 77 

 Sambo, 192 

 SA TINDERS, 102 

 Scale of success, 6 

 Scalp muscles, 197 



SCHAFFNER, 48 

 SCHLEIDEN, 215 

 SCHWANN, 215 



Sea-urchin, 230, 231 

 Secondary sexual characters, 



287 



Sedum, 35, 36 

 Segregation, 103, 113, 119, 168 



of defectives, 327 

 SEILER, 270, 272, 275 

 Selection, 121, 166 



genotypic, 200, 213 



mass, 200 



natural, 41, 42, 51 



phenotypic, 201 



pure line, 133, 136, 137 

 Self fertilization, 97, 134 

 Sex cells, 224 



chromosome, 245, 265 



cycle, 272 



determination of, 264, 265 



genes, 269 



intergrades, 290, 291, 292 



linked, 277, 283, 284 

 Sexual reproduction, 12, 221 

 SHAKESPEARE, 63, 316 

 SHARP, 242, 247, 248, 285, 287 

 Sheep, 18, 48, 75, 171 

 Shirley poppy, 47 

 SHIRREFF, 204 

 SHULL, A. F., 275, 

 SHULL, G. S., 46, 76, 102, 105, 



106, 165, 207, 214, 249 

 Siamese twins, 50 

 Silkworms, 82, 102, 249 

 Simocephalus, 137 

 Simplex, 107, 195 

 Single genes, 149 

 SITKOWSKI, 70 

 Skew curves, 31 

 Skin color, 190 

 Simplex, 107, 195 

 SMITH, 89, 137, 275, 290 

 Smooth-margined leaves, 102 

 Smooth peas, 100, 107, 173 

 Snails, 28, 33, 102, 171, 174 

 Snapdragon, 102, 165, 249 

 Social hindrances, 332 

 Somatic characters, 67 



differentiation, 255 

 Somatic induction, 70, 91 



mutation, 53, 55 



variation, 21 



