RELATION OF GENES TO CHARACTERISTICS 20^ 



NOTES AND REFERENCES ON CHAPTER VIII 



1. Page 1 86. For the evidence on duplicate genes in the shepherd's 

 purse, see G. H. Shull (1914), Duplicate Genes for Capsule Form in 

 Bursa bursa-pastoris. Zeitschr. fiir Induktive Abstammungs-und Verer- 

 bungslehre, Bd. 12, pp. 97-149. 



2. Page 186. See W. E. Castle (1914), Piebald Rats and Selection. 

 An Experimental Test of the Effectiveness of Selection and of the 

 Theory of Gametic Purity in Mendelian Crosses. Carn. Inst. Publ. 

 No. 195. 56 pages. 



3. Page 195. M. Demerec (1934), Biological Action of Small 

 Deficiencies of X-Chromosome of Drosophila melanogaster. Proc. Nat. 

 Acad. Sci., vol. 20, pp. 354-359. 



4. Page 198. For inheritance of characteristics in man, see the refer- 

 erences given at the end of Chapter IV. 



5. Page 199. On the production of identical twins in the armadillo, 

 see H. H. Newman (1913), The Natural History of the Nine-banded 

 Armadillo of Texas. Amer. Naturalist, vol. 47, pp. 513—539. 



6. Page 200. Many investigations and publications on twins, partic- 

 ularly in man, have been made of late; the subject is a most active one. 

 The following may be consulted : 



By H. H. Newman (1917), The Biology of Twins. 186 pages; 

 (1923), The Physiology of Twinning. 230 pages; Mental and Physi- 

 cal Traits of Identical Twins Reared Apart; a .series of articles in 

 the Journal of Heredity, 1929 to 1934; By H. J. Muller (1925), 

 Mental Traits and Heredity. Journal of Heredity, vol. 16, pp. 433- 

 448; By N. D. M. Hirsch (1930), Twins, Heredity and Environ- 

 ment. 159 pages; By J. Lange (1930), Crime and Destiny. 250 pages. 



