86 





HKRKIHTY AND SKX 



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3 3 1 



Fig. 4(i. - - Illustrating Mendel's cross of yellow-round with green-wrinkled 

 peas. The figures show the peas of Fi and F 2 in the latter in the charac- 

 teristie ratio of 9 : 3 : 3 : 1. 



