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FRANK E. LUTZ 



Pure Females 



Fare Males 



Normal f x 

 Wincriess ^ 



Normal f x 

 Miniature ^ 



Normal Wingless MiniatuTe 



Fig. 1 Theoretical composition of zygotes. The squares represent the X- 

 chromosome. The small circles represent the rest of chromosomes. Where they 

 are plain their composition is supposed to be normal. 



