SEX-LINKED INHERITANCE IN DROSOPHILA 37 



The analysis follows: 



SRbYIJrX — SRbYBrX 

 LWByBrX — SWbyBr 



SRbYBrX — LWByBrX 

 ' SRbYBrX — SwbyBr 



SRbyBrX — ' SRbYBrX — LWByBrX — LWBYBrX , 

 Gametes LRbyBrX — LRbYBrX — SWByBrX — SWBYBrX j ^^^ 

 of Fi 



SRbyBrX — SRbYBrX — SWbyBr — SWbYBr Sperm 



Females Males 



SRBr 1 LRBr 1 SRBr 1 LRBr 1 



SRY 3 LRY 3 SRYel 3 LRYel 3 



SRBl 1 LRBr 1 LWBl 1 SWBl 1 



SRN 3 LRN 3 LWN 3 SWN 3 



This last cross gave, the first time it was tried, the results 

 recorded below. These results were not published because of 

 the very high number of the cross-over class, SRN = 17. In 

 the repetition of the experiment the class is again large, but 

 not so excessive as in the former instance. As there were no 

 grounds for suspecting these results in other respects we feel 

 that the only fair course is to add them here. In the sum totals, 

 however, they have been omitted. 



SRY 9 by LWB c^ 



LRN 9 = 76 



' " SRY cf = 86 



