8 



GENETIC VARIATIONS 



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Figure i. Characteristic features in the organization of the germ 

 plasm. The chromosomes and chromomeres, as seen under the micro- 

 scope, in different developmental stages. A and B. Chromosomes and 

 chromomeres in nuclei of the grasshopper, in the thread-like stage of 

 development, after Wenrich, 1916. The enlargements on the threads, 

 known as chromomeres, probably show the location of the different 

 genes: in any case their arrangement and position are the same as 



