The phenotypic ratio obtained in quantitive inheritance of a dihybrid cross is
or
In a cross between red kernelled and white kernelled varities of wheat showingf polygenic inheritence the phenotypic inheritence the phenotypic ratio in `F_(2)` generation will be
A. `1 : 2 : 1`
B. 1 : 4 : 6 : 4 : 1
C. 1 : 6 : 15 : 20 : 15 : 6 : 1
D. 9 : 3 : 3 : 1