1916] Reeves: Inheritance of Extra Bristles in Drosophila 



505 



TABLE XVI 



Normals Extracted from Extra X Extra and Bred Together in Mass 

 Culture Through Five Generations 



Ratios 



101:15 



101:2 



95:6 



38:5 



105:1 



93:1 



87:1 



70:5 



95:1 



Ratios 

 to 1 



6.7:1 



50.5:1 



15.8:1 



7.6:1 



105:1 



93:1 



87:1 



14:1 



95:1 



Expectation 



Agreement 



Conclusion 



101.5:14.5 



7:1 



7:1? 



101.4:1.6 



63:1 



63:1 



94.7:6.3 



15:1 



15:1 



37.6:5.4 



7:1 



7:1? 



104.3:1.7 



63:1 



63:1 



92.5:1.5 



63:1 



63:1 



86.6:1.4 



63:1 



63:1 



70.3:4.7 



15:1 



15:1 



94.5:1.5 



63:1 



63:1 



The ratios of tables XV and XVI are rearranged in serial order in 

 tables XVII and XVIII. It seems possible that the ratios 28.3 :1, 

 33.3 :1, and 42.5 :1 in table XVII may represent combination families, 

 since they are intermediate between 15 :1 and 63 :1. In table XVIII 

 the ratios appear to be more closely grouped around 7 :1, 15 :1, and 

 63:1. 



TABLE XVII 



Ratios 

 to 1 



Actual 

 numbers 



101:13 



Ratios 

 to I 



28.3:1 



Actual 

 numbers 



85:3 



Normal X Normal Matings in Mass, Serially Arranged 



Actual 

 numbers 



100:3 

 85:2 



127:2 

 75:1 



105:1 



7:1 



15:1 



Ratios 

 to 1 



33.3:1 



42.5:1 



63.5:1 



75:1 

 105:1 



63:1 



TABLE XVIII 



Extracted Normal X Normal Matings in Mass, Serially Arranged 



Ratios 

 to 1 



6.7:1 



7.6:1 



7:1 



Actual 

 numbers 



101:15 

 38:5 



Ratios 

 to 1 



14.1:1 

 15.8:1 



Actual 

 numbers 



70:5 

 95:6 



15:1 



Ratios 

 to 1 



50.5:1 

 87:1 

 93:1 

 95:1 



105:1 

 63:1 



Actual 

 numbers 



101:2 



87:1 



93:1 



95:1 



105:1 



Considering these results in general, the ratios 15 :1 and 63 :1 

 appear to fall in with the Mendelian equivalent-factor hypothesis. In 



