THEORY OF EVOLUTION 



VESTIGIAL GRAY 



H 



: 



LONG EBONY 



" 



LONG GRAY 



f 



FIG. 24. Cross between long ebony and gray vestigial flies. 



spring are gray with long wings. If these are 

 inbred they give 9 gray long, 3 gray vestigial, 

 3 ebony long, 1 ebony vestigial (figs. 24 and 



25). 



