62 



HEREDITY AND EVOLUTION IN PLANTS 



FIG. 42. Mendelian segregation in maize, a, the starchy parent; b, 

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

 a and b, showing the dominance of starchiness; d, the second hybrid (Ft) 

 generation, showing the segregation of starchiness and sweetness with the 

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

 of d; e, f, 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.) (Cf. Fig. 41.) 



