Question

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

Options

• tallness is the dominant trait

• shortness is the dominant trait

• tallness is the recessive trait

• height of pea plant is not governed by gene ‘T’ or ‘t’

Answer 1

tallness is the dominant trait

Explanation - 

In a cross between two organisms differing in one pair of contrasting traits, F₁ hybrid shows only one of the parental traits, and this trait is called the dominant trait. Similarly, in the question, since the only tall trait is expressed in the progeny resulting from a cross between a tall plant and a short pea plant, tallness is the dominant trait.