Two pure-breeding phlox plants were crossed, one with dark-blue flowers and the other with pink flowers. The F1 generation all had dark-blue flowers. When the F1 were crossed with each other, the F2 generation consisted of 176 plants: 101 with dark-blue flowers, 33 with light-blue flowers, 30 with red flowers, and 10 with pink flowers
-How is flower color controlled in phlox?

Question

Quizplus · Accepted Answer

The phenotypic ratio in the F2 generation suggests that two genes are involved, with their alleles interacting additively to produce the observed flower colors.

Two Pure-Breeding Phlox Plants Were Crossed, One with Dark-Blue Flowers