A plant with two 'small' genes breeds with a plant with two 'tall' genes to produce:(a) small plants and tall plants in the ratio 1:3   (b) all small plants(c) all tall plants        (d) tall plants and small plants in the ratio 3:1

Correct Answer: (c) all tall plants

Explanation:

When a plant with two small genes (tt, which is recessive) breeds with a plant with two tall genes (TT, which is dominant), it will produce all tall plants (Tt) as tall gene (TT) is dominant over small gene (tt).