No. 575] 



AN APTEROUS DE0S0PT11LA 



679 



Long, vermilion ? A P MWX-a P mwX, 

 Long, vermilion cT A P MWX-a v . 



F 2 Long vermilion $ and J 1 

 Long, white <$ 

 Miniature, vermilion $ 

 Miniature, white J 1 

 Apterous, vermilion $ and 1 

 Apterous, white J 1 



TABLE I 



Offspring from Pairs Heterozygous for Aptero 



Average ratio of winged to apterous, 3.12:1. 



An analysis of the F 2 is not essential here and is omitted 

 for the sake of brevity. It may be derived from the P, 

 formulas. Table II indicates the expected classes and 

 ratios in F L > and gives the actual numbers obtained in cul- 

 ture No. 59, in which each class was recorded separately. 

 In subsequent cultures of this experiment no attempt was 

 made to separate any but the winged and apterous classes. 

 Counts of the latter are given in Table III. 



