BRISTLE INHERITANCE IN DROSOPHILA 



447 



GD = 3.8702684-0.00874 GP 



GD = grade of granddaughters 

 GS = grade of grandsons 

 GP = grade of grandparents 



GS = 2.5877662+0.00732 GP 



The correlation coefficients calculated from these data are; 



GD X GP. 

 GS X GP. 



-0.0122±0.0068 

 +0.01 23 ±0.0070 



r/Er 



1.79 

 1.75 



Z 

 LlI 



Q 



_J 



-4 



I 



U 



Q 



2 



< 



o 



03 

 (/) 

 z 

 < 



LI 



EMPIRICAL MEANS AND 

 REGRESSION STRAIGHT LINES 



GENERATION 53 



GRANDDAUGHTERS 



GRANDSONS 



3 4 5 6 7 



GRADES OF GRANDPARENTS 



Fig. 8 Empirical means and regression straight lines for generation 53; 

 grandparents by grandsons and granddaughters. 



