CHROMOSOMES AND CYTOPLASM IN PROTOZOA 



55 



which its present constitution is due, and 

 even in the presence of another nucleus of 

 different constitution. During this period 

 cytoplasmic inheritance may occur ; the new 

 cells produced show the characteristics due 

 to this cytoplasmic constitution impressed 

 on it by a nucleus that is no longer present. 

 But in time the new nucleus asserts itself, 

 impressing its own constitution on the cyto- 

 plasm. 



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