There is a tremendous amount of genetic diversity in maize. Much of the maize you have seen may look the same, but across the world there are tens of thousands of varieties of maize that are different colors, sizes, have different growing times, nutritional content, etc. Scientists at Cornell University are studying the diversity of maize, trying to connect two things: phenotype and genotype. A phenotype is any physical attribute that can be measured (also known as a “trait”). It can be something you can see like how tall the plant is, what color the kernels are, or when the plant flowers.