SEX-LINKED LETHALS IN DROSOPHILA 



85 



TABLE 3 

 Red-eyed daughters of L, which when mated to white-eyed males, gave 2:1 sex-ratio. 



L4.. 



L5.. 

 Dup. L5.. 



L8.. 

 Dup. L8.. 



L9.. 

 Dup. L9.. 



L18. 

 Dup. LIS. 



L20. 

 Dup. L20. 



L23. 

 Dup. L23. 



L24. 

 Dup. L24. 



L26 

 Dup. L26. 



L32. 



L34. 

 Dup. L34. 



Totals . . . 



There are two classes of daughters (A and B) alike in appear- 

 ance, but one of them (A) is heterozygous for lethal. The o£f- 

 sipring of half the daughters (B) should be, as we have seen in table 



i,w 



X 



Figure A 



2, non-lethal, and of the other half (A) lethal-bearing. Table 

 3 is the result of the mating of such daughters (A) heterozygous 

 for lethal and white to white males. 



In order to represent in a diagram what takes place in (A) let 

 the pair of sex-chromosomes of the F2 female be drawn in two 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 17, NO. 1 



