A dihybrid plant with genotype GgTt. In this plantfirst gene pair is codominant and another issemidominant on selfing of this plant, what will be phenotypic ratio ?
(1) 2 : 1
(2) 3 : 1
(3) 3 : 6 : 3 : 1 : 2 : 1
(4) 1 : 1 : 1 : 1 : 2 : 2 : 2 : 2 : 4