62 



HEREDITY AND EVOLUTION IN PLANTS 



Fig. 42. — Mendelian segregation in maize, a, the starchy parent; 6, 

 the sweet parent; C, the first hybrid (Fi) generation, produced by crossing 

 0, and b, showing the dominance of starchiness; d, the second hybrid (F2) 

 generation, showing the segregation of starchiness and sweetness with the 

 ratioof three starchy to one sweet (wrinkled) grain. Lower row, daughters 

 of d; e, /, and g resulted from planting starchy grains. One ear in three is 

 pure starchy, the other two mixed; h, result of planting sweet (wrinkled) 

 seed. They are pure recessives, and the ear is pure sweet. (After 

 East.) (C/. Fig. 41.) 



