During an experiment, a scientist crosses a pea plant that has purple flowers with a pea plant that has white flowers. The plants that result from this cross in the F1 generation have both purple and white flowers. What can the scientist conclude?
That the dominant colour was in a heterozygotic plant, and the recessive in a homozygotic plant (by necessity).
Let's say the dominant colour is purple (P) and the recessive colour is white (w).
The purple plant may be
The white plant can only be
Then we have
A homozygotic purple would only produce purple flowers: