During a recent trip to Northern Europe you find 3 geographically isolated white-flowered strains, called A, B and C, of a rare species of wild rose, C. godshalkae, that usually produces red flowers. You suspect that these strains each arose independently. To gain insight into the origins of the white color, you collect individuals from the different locations and cross them. You show that the mutation that produces white flowers is recessive in each case. A. Your cross of strain A X strain B produces offspring with red flowers. How do you explain this result