Sarah is doing an experiment on pea plants. she is studying the color of the pea plants. sarah has noticed that many pea plants have purple flowers and many have white flowers. sarah crosses a homozygous white flower and a homozygous purple flower. the cross results in all purple flowers. what is true of the color of pea plants? a. purple flowers and white flowers are recessive to red. b. purple flowers are dominant to white flowers. c. white flowers and purple flowers are codominant. d. white flowers are dominant to purple flowers.