HEREDITY 



145 



offspring are interbred, the polled and horned characters 

 separate in the second generation in the proportion of 

 25 per cent pure polled, 50 per cent hybrid polled, and 

 25 per cent pure horned. The pure polled individuals, 



Horned 



HH HH HH 



1- Polled Hytr/d 



2- Pure Pa/fed 



3- Pure Horned 



FIG. 17. Diagram illustrating mendelian inheritance as exhibited 

 in the transmission of polled and horned characters in domestic cattle. 



if bred to others of their own kind, produce only pure 

 polled offspring. If the pure horned offspring likewise 

 are mated with pure horned individuals, their offspring 

 produce pure horned offspring. If the 50 per cent hybrid 

 polled individuals are bred to other hybrid animals, the 



