No.5S3] BOLE OF EXVI1WXMENT IY DROSOPHILA 415 



~l<>" r:„rly Ab?. o (U GR fairly In sli,l„]y Ab ?. 



J 5 GRN and 4 GR quite Ab?.") 6 GW nearly N?. 

 •) GW? quite to fairly Ab. 3.f GR sli-htly Ab to N ?. 

 , J13 GRN ?. [28 GRN ?. 



: -)lf> GW quite to slightly Ab ?. 4 ") 3 GWN ?. 



(15 GRN?. f 17 GRN?. 



9 GW fairly Ab to N ?. 5 « 2 GWN?. 



U GRN?. 6 .{ 6 GRN?. 



{lO GWN?. 



In (3) the females heterozygous in black were slightly 

 nore normal than the grays. In (4) there is hardly any 

 lifference, but so far as difference is noticeable the hetero- 

 zygous typo (GTT) is again more nearly normal. This 

 lifference was even more apparent in a second culture 

 rom the same parents. 



'HE RELATIVE 1 X FLt'KX* '}■] OF TIIK FGG AND OF TIIF SI'KKM 



If most of the flies were distinctly abnormal this was indi- 

 cated by Ab to N, if more of the Hies were normal or nearly 

 so but some were abnormal this was indicated by N to Ab. 

 If the flies were normal in appearance this was indicated 

 by N. The results for many of the cases recorded in the 

 preceding tables are brought together in the next table. 

 The results are far from uniform, as was to be expected, 



frequently norma 

 cross the tendency 



