No. 611] 



NOTES AND LITERATURE 



701 



It can be readily seen that the red eye acts as a non-sex-linked 

 recessive character with the red class falling a little short. 

 Shortage of the mutational class frequently occurs. It seems to 

 make no difference whether the red male or red female is used in 

 the cross. In most cases w^hen mass cultures were made, the ex- 

 pected 3 to 1 ratio was less nearly approximated. The ratio of 

 all the flies examined in the was 3.32 normals to 1 red. 



The Genetic Behavior op Chocolate Eye 

 A pure stock of chocolate was obtained by mating some of the 

 first observed chocolate males to their virgin chocolate sisters. 

 This stock has bred true for several generations but since the 

 eye changes so rapidly to a color approximating normal, in 

 stocks where the flies are allowed to become more than twenty- 

 four hours old, all gradations between the typical chocolate and 

 normal will be found. The chocolate males and females were 

 bred to wild normals and the flies were all normal. The re- 

 sults of the F, of these crosses are shown in Table II. 



TABLE II 

 F, OF Chocolate X Wild Cross 



with the chocolate class falling considt-rablv below the expected 



