Question 7
Which pair of factors describes a tall pea plant that also carries the factor for dwarfness?
The right answer is the one marked above.
Tt. The capital T is the dominant factor for tallness, so the plant is tall; the small t is the recessive factor for dwarfness, carried but hidden.
There is no such thing as a plant with only one factor. Every plant carries two for each character, one from each parent — a gamete is what carries one.