A group of students are studying flower color inheritance in the garden pea plant (Pisum sativum). They obtain a purple-flowered pea plant of unknown ancestry, allow it to self-pollinate, and collect 606060 of its seeds. After planting the seeds, they observe the growth of 424242 purple-flowered plants and 181818 white-flowered plants. Which of the following best explains the flower colors seen in the offspring?
Choose 1

(Choice A)
A
A somatic mutation in the flower color gene produced the white flower color.

(Choice B)
B
Purple flowers and white flowers are codominant.

(Choice C)
C
The flower color changes as the plants mature.

(Choice D)
D
White flower color is a trait recessive to purple flower color.