Nos. 618-619] SHORTER ARTICLES AND DISCUSSION 



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Fz Zyr/otfis: Phcnotypiti Ratio* 



segregable genes in the members of the F 2 ratios is doubtless 

 much closer than any completely mechanical contrivance can 

 show. In the experiments the blending quite properly is shown 

 complete in the zygote and soma, but if the analogy were carried 

 still further one should be able to dip into the gamete-holding 

 test-tubes and there rind t hat some of the original F, genes remain 

 unchanged— the unchanged germ-plasm which is left behind— and 

 to lift out well-defined gametes with "A" or "a" and "B" or 

 "b" variously combined, according to the constituent genes of 

 the zygote, for in the living germ-cell cycle, not the blending of 

 the soma, but clean-cut segregation is the rule. Representing 

 the gametes by capsules containing genes in solid form, which 

 capsules and genes would be slowly soluble in the substratum of 

 the zygote, would drive the analogy a little closer to nature. 



