Suppose a group of researchers analyzed a new species of flowering plant. in this species, flower color is determined by two genes. they crossed a truebreeding red-flowered stock with a truebreeding white-flowered stock. they then crossed the f1 offspring together and analyzed the next generation. upon examining the flower color, they found that the f2 generation contained 89 purple, 31 red, and 39 white flowers. what genetic term best describes the inheritance pattern of flower color for this species?