You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered one. All of the F1 are pink. What does this say about the alleles for the parental traits?
a. Pink is dominant, while red and white are recessive.
b. Red is completely dominant.
c. Both red and white are pleiotropic.
d. Red and white are codominant.
e. Red shows incomplete dominance over white.