

HEREDITY AND SEX 



A male with short or miniature wings appeared in 

 my cultures Fig. •"> s >. Mated to long-winged females 

 only Long-winged offspring were produced. When 

 these were mated to each other, there were produced 



X 



Y 



XVI 



X Y 



:^XY 



Fig. -i~. — Upper series, back crass of Fi 9 to white $. Lower series 

 back cross of l-\ red-#yed $ to white ?. 



long-winged females (50%), long-winged males (25%) 

 and miniature-winged males (25%). 



It is possible to produce, in the way described for 

 eye color, miniature-winged females. 



When such miniature-winged females are mated to 

 long-winged males, all the daughters have long wings, 

 and all the sons have miniature wings (Fig. 39). If 



