CHAPTER 1 



Typical 

 Offspring 



Typical 

 Offspring 



/l\ /l\ /l\ 



PURE LINE I 



B 



/l\ /l\ 



PURE LINE II 



/l\ /l\ /i\ 



* 



• • • ^ 



NEW MUTANT 

 PURE LINE 



OLD PURE LINE 



figure 1-1. Relative sizes of seeds obtained from self-fertilized bean plants. 



