366 A. H. STURTEVANT 



four characters involved have no selective value, except in so 

 far as results from the fact that at least two of these classes are 

 less active then normals. 



In general it is probable that, in Drosophila, neither sex exer- 

 cises any " choice " in the selection of a mate. A female that 

 is ready to mate will accept any male, and a male that is ready 

 to mate will do so with the first female that will allow him to. 



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