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A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because 

(a) tallness is the dominant trait 

(b) shortness is the dominant trait 

(c) tallness is the recessive trait 

(d) height of pea plant is not governed by gene ‘T’ or ‘t’

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The answer is (a) tallness is the dominant trait

In monohybrid cross only dominant characters are expressed in first progeny

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