i6 



GENETIC VARIATIONS 



P M P M 



Father 



Hother 



< 



SOME 



of the 



GERM 

 CELLS 



SOME 



ofihe 



OFFSPRING 



Figure j. Diagram to illustrate the recombination of genes when 

 offspring are produced. Above are shown, in the two rectangles, a 

 small portion of the double string of genes in each parent; in each 

 string but eight of the many genes are shown. In each parent the 

 genes of paternal origin (P) are represented as solid, those of maternal 

 origin (M) in outline. In the middle row are shown a few of the 

 many possible different combinations of genes in the germ cells, pro- 



