Multiple Alleles — Definition & Examples

Gene A codes for color in a rare tropical flower. There are 3 possible alleles: X codes for purple color, Y codes for yellow, and Z codes for white. Z is dominant to Y, and X is dominant to both Z and Y. If you cross a plant with the genotype A$^X$A$^Y$ and a plant with the genotype A$^X$A$^Z$, what is the probability that the new plant will be white?

Hint: Make a Punnett square to help you visualize the cross!