94 



T. H. MORGAN 



ratio 11:9 indicates. The other three females, Gi, G2, Ciwere 

 lethal bearing as their ratios had indicated. 



An examination of the male classes of the lethal lots shows that 

 the lethal factor in question is the original lethal I that has reap- 

 peared, now linked to white instead of to red as originally. As a 

 consequence the lethal males are now the white males, while before 

 they were the red males. The following calculations will sub- 

 stantiate these statements. 



The yellow white females, that carry the lethal, received from 

 their mother a sex-chromosome carrying yellow (y), lethal (h), 

 white (w) factors (upper line, fig, B); and from their father a 



