A NEW SEX-LINKED CHARACTER IN DROSOPHILA. 



SABRA COLBY TICK, 



A new sex-linked character (Figs. I and 2) recently appeared 

 in Drosophila ampelophila in an experiment involving rudi- 

 mentary and long-winged flies with normally shaped eyes (Figs. 

 3, 4). The new character "barred" eye appeared in a single 



I 4 



FIGS, i AND 2. Pure barred (male) above and from the side. 

 FIGS. 3 AND 4. Normal eye (side view smaller fly). 

 FIGS. 5 AND 6. Two heterozygous eyes, both in side view. 



male. The ommatidia are reduced in number and are restricted 

 to an area shaped like a vertical bar or band, the edges of which 

 are more or less irregular in shape. 



BARRED EYE BY NORMAL EYE. 



When the barred male was bred to normal-eyed females, the 

 FI generation showed the barred eye in the females only (Figs. 

 5 and 6), the males being normal. This is what would be 



expected if the new character is sex-linked and dominant. The 



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