298 mr. c. c. hurst : experimental studies 



Table 16. 

 Extracted Normals x Albinos and Hybrids (F^)' 

 M citings. Normal. Albino. 



H 7 X E N 28 7 



A 23 X E N 28 6 



E N 32 X A 2 7 



E N 44 X A 24 7 



E H 20 X E N 28 6 



E N 30 X H 10 5 



E N 30 X H 10 7 



E N 32 X H 12 5 



E N 32 X H 10 5 



E N 32 X H 10 6 



EH 33 XEN28 6 



EN 36 X EH 2(3 (5 



EH36XEN28 3 



E N 43 X E A 14 7 



Total 83 



The extracted hybrid normals mated together, and also with 

 albinos, in each case produced a mixture of normals and albinos 

 in Mendelian proportions. 10 extracted hybrids mated together 

 and with 2 hybrids of the first generation produced 55 young, 

 of which 38 were normals and 17 were albinos ; the Mendelian 

 expectation for 56 young is 42 normals and 14 albinos. The 

 excess of albinos appears to be due to the peculiarity of EH 26, 

 which gave 11 normals and 9 albinos instead of the expected 15 

 and 5. The individual matings were as follows : — 



Table 17. 



Extracted Hybrids X Hybrids (Eg). 



Matings. Nonnal. Albino. 



E H 29 X H 10 5 2 



E H 29 X E H 27 5 1 



EH 31 X H 12 3 1 



EH 31 X EH 26 3 3 



E H 36 X H 10 4 1 



E H 36 X E H 26 4 4 



E H 42 X E H 26 4 2 



E H 53 X E H 37 6 1 



E H 54 X E H 41 4 2 



Total 38 17 



