74 THEORY OF EVOLUTION 



2 whites, and not the usual 3: 1 Mendelian 

 ratio. Yet, as will be shown later, the result 

 is in entire accord with Mendel's principle of 

 segregation. 



FIG. 35. Diagram showing a cross between a white eyed male 

 and a red eyed female of the fruit fly. Sex linked inheritance 



