98 



T. H. MORGAN 



Crosses with white miniature males 



A number of daughters were taken from No. 12 (indicated 

 by a star in table 10) and bred in pairs to white miniature 

 males. Since No. 12 was carried further, I have selected it first 

 for illustration. 



The data are arranged in table 11, under two headings, viz., 

 those pairs that gave a sex-ratio of 1:1, and those that gave 2:1. 

 The data from pairs with a 1:1 ratio show nothing except the 

 association of white and miniature. The data from the 2:1 

 ratio, in which the second lethal is present, show no males in the 



TABLE 10 



