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?

1 Answer

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 #PP or Pw#
The white plant can only be #ww#

Then we have #Pwxxww->Pworww=#flowers of both colours

A homozygotic purple would only produce purple flowers:

#PPxxww->Pw=# purple