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

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Solution

(c) all tall plants
All tall plants will be produced because tall genes are dominant over small genes.

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Question 22
In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is

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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

(c) all tall plants All tall plants will be produced because tall genes are dominant over small genes.

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

(c) all tall plants
All tall plants will be produced because tall genes are dominant over small genes.