AN ANALYSIS OF THE EFFECT OF SELECTION. 

 Table 17. — Inbred Plus Lines Crossed. 



21 



1 Does not include culture 2054, in which the mother was not-Dichaet. 

 10 11 



Fig. 10. — Means and standard deviations for cross of two inbred plus lines. 

 Fig. 11. — Means and standard deviations for cross of 1002 inbred plus 

 and speck (1331) minus lines. 



was nearly the same as that in Fi, the F2-F3 and F3-F4 parent-offspring 

 correlations were not significantly different from 0, and the means of 

 the plus and minus selected series in F3 and F4 were practically identi- 

 cal. This constitutes practically a proof that the two lines did not 

 differ with respect to modifying genes. The result, while surprising, 

 is by no means highly improbable on the multiple-factor view. The 



