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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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The answer is (b) 3 : 1

  • A cross between pure tall plant (TT) and short plant (tt) would produce progenies with following genotypes.
  • TT(Pure tall), tt( Pure short) andTt ( Mixed tall). 
  • This makes the ratio between tall and short plants is 3:1.

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