Question

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.

Answer 1

Answer: (A)

Tallness is the dominant trait.

• A cross between a tall plant ( TT ) and short pea plant ( tt ) resulted in progeny that were all tall plants because tallness is the dominant trait.

In F${}_1$ generation, the cross between TT and tt will result in all tall plants. Thus, tallness is the dominant trait.

• Whenever two traits of a character are crossed, the F${}_1$ plants show only one of the traits, this trait is called as the dominant trait. The other trait (dwarfness) that does not express itself in F${}_1$ generation is called as the recessive trait.