MENDEL'S LAW OF HEREDITY 



the black-white cross, dominant individuals are 

 to the corresponding recessives as three to one. 

 Therefore, we shall expect the short-haired in- 



Gameles 



Gametes 



FIG. 30. Diagram to explain the result of a cross between the 

 sorts of guinea-pigs shown in Figs. 26 and 27. L stands 

 for long hair, S for short hair, D for dark hair, and W for 

 white hair. Dominant characters are indicated by heavy 

 type. 



dividuals in F 2 to be three times as numerous 

 as the long-haired ones, and dark ones to be 

 three times as numerous as white ones. Fur- 

 ther, individuals which are both short-haired 



43 



