A CASE OF MENDELIAN INHERITANCE COMPLICATED 



BY HETEROGAMETISM AND MUTATION IN 



OENOTHERA PRAT IN COL A 



BY 



FRIEDA COBB 



A DISSERTATION SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIRE- 

 MENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY AT 

 THE UNIVERSITY OF MICHIGAN 



1921 



