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328 



MUTATIONS IN EYE-COLOR OF DROSOPHILA. 



Red 9 (out ofR 9 X P <?) X Red & (out of P $ X R <?). 



Bottle. 



A 



B 



C 



9 



Red. 



206 



31 

 401 



638 



Pink 



74 



6 



113 



d" 



Red. 



Pink 



237 



19 

 319 



63 

 8 



88 



193 



575 



159 



Total. 



Red. 



443 

 50 



720 



1,213 



Pink 



137 



14 

 201 



352 



Average proportion 



Proportion of 

 Red to Pink. 



3.2:1 

 3.6:1 

 3.5:1 



3.4:1 



In order to see if the amount of moisture in the bottles had any influence on 

 the results, counts were made from day to day from two bottles that were quite 

 wet at the beginning, when the first flies emerged, and were kept wet until the 



last flies had been counted. In the next two tables the results are given 



They 



seem to indicate that as the bottle gets older the Pinks increase proportionately 

 in number, and, towards the end, may actually exceed the Reds. 



Count 1 

 Count 2 



Count 3 

 Count; 4 

 Count 5 

 Count 6 



Red 9 (out of P 9 X R o") X Pink d 1 . Wet bottle. 



Proportion of 

 Red to Pink. 



2.27 : 1 



1.2 : 



1 



1.13: 



:1 



1.27: 



:1 



0.81: 



:1 



0.96: 



:1 



Red 



1 

 1 



3 



25 

 18 



7 



9 





Pink 



2 

 2 



2 

 23 

 27 



6 



Red <? (out of 



Red. 



1 

 1 



13 



19 



8 





cf 



Pink 



1 

 1 



12 

 22 



8 



Red 



o 



2 



3 



38 

 37 

 15 



Wet bottle. 



Total 



Pink 



2 



3 



3 



35 



49 

 14 



Proportion of 

 Red to Pink. 



0.9 :1 



1.1 :1 

 0.75 : 1 



1.07 : 1 



The consecutive counts of two "dry" bottles, that were fairly dry when the 

 flies began to emerge, are given in the next two tablesi 



Count 1 

 Count 2 

 Count 3 

 Count 4 

 Count 5 

 Count 6 



Red. 



7 

 27 

 33 

 17 

 12 

 10 



9 



(out of 



Pink 



1 

 11 



35 



27 



7 



7 



Red. 



2 

 23 

 25 

 11 

 10 



8 



cf 



Pink 



1 



7 



25 



8 



4 



12 



Dry bottle 



Total. 



Red. 



9 

 50 

 58 

 28 

 22 

 18 



Pink 



Proportion of 

 Red to Pink. 



