Lush: Inheritance in Swine 



67 



A RED BOAR OF THE SECOND GENERATION OF BERKSHIRE X DUROC- JERSEY CROSS 



This boar was lighter colored on the belly than on its sides. The presence of two shades of red on 

 the same animal was characteristic of nearly one-fourth of the second generation. Compare with 

 the nearly solid black pig shown on the opposite page. (Fig. 16.) 



trasted with the absence of black gives 

 a perfect 3 : 1 ratio in F2 and a close 

 approximation to a 1 : 1 ratio in the 

 backcross. Therefore it seems proven 



beyond doubt that the Berkshire pos- 

 sesses a single factor for black spots 

 which is absent from the Duroc-Jersey 

 and the Tamworth. The size and 



Table III 



