THE 'bar eye' mutant OF DROSOPHILA 



523 



TABLE 6 



Minus selection 



Line F 



0.60 for the second and 0.57 for the third. For the minus hnes 

 the corresponding figures are 0.77, 0.64 and 0.60. On the other 

 hand regression toward the mean of the parental generation 

 increases with successive selections. (Table 9.) The average 

 regression in this respect in the plus lines is 0.67 for the first 



