JAMB - Biology (1979 - No. 33)
If you cross breed a tall variety (Tt) of maize with a short variety (tt), the ratio of tall to short plants in the offspring will be
2:1
1:2
1:1
1:3
3:1
Explicació
From the crossing, we have 2Tt : 2tt ⇒ 2 : 2 = 1 : 1
(See diagram above for better understanding)