296 me. c. c. hurst : experimental studies 



Table 13. 

 Extracted Albinos x Albinos (F3). 



Matings. Normal. Albino. 



EA16XA2 5 



E A 16 X A 61 7 



EA34XEA14 5 



E A 45 X A 61 4 



Total 21 



The extracted albinos, like the pure-bred albinos, proved to be 

 recessive to pure normals. 



6 extracted albinos mated with 3 pure and 3 extracted normals 

 produced 62 young, all of which were normals, in accordance with 

 the Mendelian expectation. 



The individual matings were as follows (E N= Extracted pure 

 normal) : — 



Table 14. 



Extracted Albinos x Pure Normals (Eg). 



Matings. Nonnal. Albino. 



E A 15 X N 25 6 



EA15 X EN 28 4 



E A 15 X N 51^- 8 



E A 16 X E N 28 6 



E A 16 X E N 28 6 



E A 34 X N 49 8 



E A 39 X N 51 2 



E A 39 X N 51 6 



E N 43 X E A 14 7 



E N 44 X E A 14 4 



E A 45 X E N 28 5 



Total 62 



The extracted albinos, like the pure-bred albinos, gave a 

 mixture of normals and albinos in Mendelian proportions when 

 mated with hybrid normals. 5 extracted albinos mated with 

 6 hybrid normals produced 47 young, of which 23 were normals 

 and 24 were albinos. The Mendelian expectation for 48 young 

 is 24 normals and 24 albinos. 



The matings were as follows (EH=Extracted hybrid): — 



