62 



SEX-LINKED INHERITANCE IN DROSOPHILA. 



male mated to a wild female gave wild-type sons and daughters. 

 These inbred give the results shown in table 44. 



TABLE 44. PI sable rudimentary forked c? X wild 9 F\ wild-type 9 



X FI wild-type d" c? . 



There were 265 males, of which 42 were cross-overs between sable 

 and rudimentary and 4 between rudimentary and forked. The values 

 found are: sable rudimentary, 16; rudimentary forked, 1.5; sable 

 forked, 17. 



LINKAGE OF RUDIMENTARY, FORKED, AND BAR. 



The three gens, rudimentary, forked, and bar, form a very compact 

 group. A rudimentary forked male was crossed to bar females and the 

 daughters (bar) were back-crossed singly to rudimentary forked males, 

 the results being shown in table 45. 



TABLE 45. PI rudimentary forked cf X bar 9 B. C. F\ bar 9 



X rudimentary forked c? c? 



The cross-over values are: rudimentary forked, i; forked bar, 0.6; 

 rudimentary bar, 1.6. The order of factors is rudimentary, forked, 

 bar. On the basis of the total data the locus of forked is at 56.5. 



