phép lai I (Aa x aa) x(Bb x BB) x (DD x dd) =) (1:1) x (1:1) x (1:1) =)1:1:1:1:1:1
II (1: 1) x (1:1) x 1 =) 1:1:1:1
III (1:2:1) x (1:1) x 1 =) 1:2:1:1:2:1 =) 2:2:1:1:1
IV (1:1) x (1:2:1) x 1 =) 1:2:1:1:2:1 =) 2:2:1:1:1
V (1:1) x (1:2:1) x 1 =) 1:2:1:1:2:1 =) 2:2:1:1:1
VI (1:2:1) x 1 x 1 =) 1:2:1
Do đó mình chọn B