Codominance or Incomplete Dominance

A gene for corn has two alleles, one for yellow kernels and one for white kernels. Cross pollination of yellow corn and white corn results in ears of corn that have an approximately even mix of yellow and white kernels. Which term best describes the relationship between the two alleles?

The answer should be Codominance. But, I often mix up between the two what is something that can help me understand what’s distinct between the two concepts?
Thanks in advance.