SEX-LINKED INHERITANCE IN DROSOPHILA 



81 



The analysis is as follows: 



vBBrX - yBBrX Black 9 

 YbBrX - YbBr Yellow ^ 



The numbers fairly approximate to expectation, 

 rocal cross is as follows: 



LRB cf by LRY 9 



Fi 



LRN 9 = 89 

 LRY cf = 59 



The recip- 



The analysis follows: 



YbBrX - YbBrX Yellow 9 

 yBBrX - ybBr Black cf 



F, 



YbBrXyBBrX 

 YbBrXybBr 



Gray 9 

 Yellow cf 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 13, NO. 1 



