474 



GENETICS IN RELATION TO AGRICULTURE 



of Jersey, as is shown by the evidence from Jersey-Angus crosses reported 

 by Kuhlman, the Fj. of which is black. A little definite experimental 

 evidence on these problems would be of more service than much 

 speculation. 



J. Wilson arranges the entire series of coat colors in a system of multi- 

 ple allelomorphs much like the one he advocates for the inheritance of coat 

 color in horses. The essential features of this system are shown in Fig. 

 189. This formulation, however, falls down in one important instance 



b b" b d b r B 



B 



FIG. 189.- 



-Wilsoa's interpretation of the inheritance of coat color in cattle, 

 are B, black; b r , red; b d , light dun; 6", brown; and 6, white. 



The factors 



in which we have definite evidence. Lloyd-Jones and Evvard report the 

 production of some red animals in F z in matings of F\ blue-gray animals 

 from a cross between the black Galloway and the white Shorthorn. 

 Such a result is entirely unprovided for in Wilson's scheme, and very 

 probably other portions of it would break down before critical experi- 

 mental tests. 



Of other characters in cattle, the white-face pattern of Hereford cattle 

 is dominant to colored face. Fig. 190 shows a typical instance of this 

 kind. This dominance of the white-face pattern extends to species 



