

THEORY OF EVOLUTION 



2 whites, and not the usual 3: 1 Mendelian 

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

 is in entire accord with JNIendel's principle of 

 se "■relation. 



Fic. 3,5. Diagram .showing a cro.s.s between a wliite eyed male 

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



