THE MUTATED GENE 



33 



addition to the stage of oxidation, the pattern of pigment 

 distribution is involved as well as the amount of the two main 

 pigments present. Within the general frame of this grouping, 

 innumerable variations may be found in regard to both total 

 amount and relative concentrations of the pigment. 



The study of development reveals that there is a characteristic 

 feature regarding the development of these colors. The follow- 

 ing table taken from Schultz shows the percentages of pupal 

 development completed at the time when pigment first appears 

 for different eye-color types. 



Table 4 

 (From Schultz) 



Type of eye color 



Group I: 



apricot. . 



brown . . . 



carnation 



clot 



prune 



purple. . . 



sepia .... 



wild 



Group II: 



garnel . . . 



light 



peach 



ruby .... 

 Group III: 



cardinal 



cinnabar . 



scarlet . . . 



vermilion 



Percentage of pupal devel- 

 opment complete at 



First appear- 

 ance of color 



53 

 53 



48 

 52 

 49 

 51 

 55 

 55 



56 

 57 

 55 

 53 



63 

 71 

 68 



71 



Darkening 

 of bristles 



81 

 83 

 79 

 74 

 76 

 71 

 79 

 83 



77 

 82 

 74 

 74 



74 



77 

 77 

 75 



There is a first group behaving very much like the Wild type, 

 and a second similar one. But with the colors of the third group 

 the pigment appears only at the time when the Wild type changes 

 from tan to red (coinciding with darkening of bristles). There is, 

 then, a typical difference in the onset of pigment formation. 



