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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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In heterozygous conditions such those of first progeny, only the dominant trait expresses itself in the phenotype. Thus, tallness is a dominant trait.

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