PHYSICAL CHARACTERS IN MAN 135 



and earless conditions are found also in the Karakul 

 breed of Bokhara. 



Lush (1922) describes the inheritance of a notch 

 in the lower margin of the ear in cattle. This character 

 is found in a Jersey bull at the Texas Agricultural 

 Experiment Station, and is inherited as a simple 

 dominant, the bull (Gamboge's Raleigh) being hetero- 

 zygous. Thirty of his calves were examined and 

 twelve found to be without the notch. There is much 

 variation in the degree of expression of the notch. 



As an example of the inheritance of a slight 

 peculiarity may be cited the case of a bilobed ear 



i 



o 



i 



B^ 



A 



\ 



B, 



i 6 i i 



A B2 B 



Fig. 27. — Pedigree Chart showing Inheritance of Right 



Bilobed Ear. 



described by Schofield (191 7). In this family the 

 condition has been transmitted through four genera- 

 tions, only the right ear having the peculiarity. The 

 accompanying chart (Fig. 27) shows its incidence. 

 One generation or even two may be skipped, and the 

 condition varies considerably in different individuals. 

 Thus, in A there is a very marked deep cleft of 

 considerable length, while in those marked B the 

 cleft is not so well marked. In BB it was only a 

 furrow, while in B^ and B, there is a deficiency of 

 hearing in the bilobed ear. The family with pitted 

 ear-lobes, described by Jenks (191 6), is a similar case. 



