Question

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

Answer 1

I assume the question asks for the number of phenotypes present.

The phenotype is the set of visible characteristics of an individual resulting from the interaction of its genotype. In this case, the number of phenotype is the total number of combinations of the characteristic purple or white and wrinkled or smooth:

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

So basically there are 4 phenotypes.       (ANSWER)