18 



THE THEORY OF THE GENE 



tlie following experiment. A male with white eyes and 

 forked bristles is mated to a wild type female (Fig. 14). 

 The offspring have red eyes and straight bristles. If one 

 of the daughters is mated to a male with white eyes and 

 forked bristles, there are four kinds of individuals pro- 



r 



y^ 



67^0 ^^"io 



Fig. 13. 

 The inheritance of two sex-linked characters, white eyes and 

 miniature wing^, and red eyes and long wings. 



