No. 573] REDUPLICATION HYPOTHESIS 



539 



TABLE I 



It will be noted that in all these cases the gametic ratio 

 approximates 2:1, or 1 : 2, according to the nature of the 

 cross. There are only four cases showing a noticeable 

 deviation from this value, and of these two involve only- 

 small counts. The most serious is the first. In this case 

 there is a deviation of 54.3 from the 2 : 1 ratio, and the stand- 

 ard error is 16.7 [V 1/3 X 2/3 X (777 + 470) = ± 16.7-]. 

 Since the deviation is slightly over three times the stand- 

 ard error, it is perhaps significant, especially since there 

 is at least one other rather large deviation (the second 

 ratio in Table I). For our present purpose, however, it 

 is probably not significant, since similar deviations occur 

 in different experiments of exactly the same type. I have 

 recorded elsewhere (Sturtevant, '14) the results of a num- 

 ber of tests of individual females heterozygous for these 

 two allelomorphic groups. Taking only those cultures 

 which produced 100 or more flies, we find the following 

 results : 



