A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as
This is dihybrid cross of a plant involving two characters in the same plant. As the progeny bloomed with violet flowers, therefore, the tall plants have genotype WW. Again the plant is neither tall nor short, so the genotype is Tt.