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
(a) 1 : 3
(b) 3 : 1
(c) 1 : 1
(d) 2 : 1
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(a) 1 : 3
(b) 3 : 1
(c) 1 : 1
(d) 2 : 1