86 



WRIGHT 



(b) Factors which affect the inten- 

 sity of color in all colored areas of the 

 skin, fur and eyes. 



2. Factors which affect the distribu- 

 tion and intensity of differentiation 

 from yellow to black— effects, of 



course, visible only in colored areas. 

 (Act as if on enzyme II.) 



{a) Factors which affect the dis- 

 tribution of a dark color (black, sepia, 

 brown, etc.) in contrast with a yellow. 



{b) Factors which affect the inten- 



<33 



BLACK 



<30 



n 



■=0 o 



SEPIA 



MALTESE 



WHITE 



BROWN 



i^n 



LIGHT BROWN 



<3® 



MALTESE BROWN WHITE 



<3S 



SOOTY RED 



c@ 



SOOTY CREAM 



<3 



o 



<D 



REDDISH MALTESE WHITE 



RED 



^ 



^ 



CREAM 



<3 



LIGHT RED 



WHITE 



Fig. 2. Production of coat colors in mammals. The inherited color factors can be 

 classified as if acting on one or other of two enzymes. For explanation see text. 



