54 



Plant Genetics 



crossed, that is, the same phenotypes, but three different 

 ratios were obtained because the genotypes were different. 



FIG. 9. Diagram illustrating behavior of complementary factors 

 in cross between red-grained and white-grained corn. R and C must 

 both be present to produce red-grained corn. 



The striking feature of this situation is that one can 

 cross two whites and get a red. This gives an insight 

 into the so-called phenomenon of reversion. For ex- 



