THE CELL-DOCTRINE 



133 



GROUPS OF CHARACTERS LINKED TOGETHER IN INHERITANCE 

 IN THE FRUIT FLY, DROSOPHILA AMPELOPHILA. Each 

 of the terms listed below is a characterization of a heritable peculiarity. 

 (After Morgan el al., " Mechanism of Mendelian Heredity.") 



It is not impossible that certain features of hereditary 

 make-up may be carried in the cytoplasm. The earliest 



