A student analyzed ears of corn that demonstrated two traits in the F2 kernels, purple or white colors and smooth or wrinkled shapes. A tabulation of 135 individual kernels gave the following results:

purple and smooth = 75
white and smooth = 28
purple and wrinkled = 24
white and wrinkled = 8

What would be the only phenotype present in the F1 generation?

purple and smooth
white and smooth
purple and wrinkled
white and wrinkled