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

  1. tallness is the dominant trait
  2. shortness is the dominant trait
  3. tallness is the recessive trait
  4. height of pea plant is not governed by gene ‘T’ or ‘t’


According to law of dominance, a trait is represented by two contrasting factors of a gene in a heterozygous individual; the allele/factor that can express itself in heterozygous individual is called as dominant trait. The other factor whose effect is masked by presence of dominant factor, is called recessive factor.

The correct option is A.

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