In this image, you can see that the male parent (Dent) is stunted in growth. This is because the seed is interbred with itself over 7 generations in a concealed area to be able to produce a pure genetic of itself before it can be bred with flint, which undergoes the same process.
Dent and Flint maize are not commercially viable to be grown alone as they don’t have high yielding contributes. Therefore, they are crossed. To do this, four rows of the female, Flint, are grown with two rows of the male, Dent, either side. Once the female reaches a certain height, the tops of the female are cut off. This is because the reproductive element of the female is the silk on the cob, so you don’t want the crop to reproduce with itself. Instead, the male component from Dent is produced in the tassel of the crop as pollen, therefore the desire is that the pollen produced from the Dent lands on the silk of the Flint, producing a hybrid grain. This is known as a two way cross.