In this example, we are using the Pastel gene as our example. Pastel is the corner stone within the Ball python world, this is why I am using it (also, it is a lot easier to visually see than a yellow belly compared to a normal). The genetics of incomplete dominant trait works in the exact same was a the recessive gene, the advantage is, that the "hets" (even though they are not hets, but are a visual variation) are visually more noticeable than a traditional recessive het.
The resulted breeding provides us with:
2 x Pastel (PN)
2 x Normal (NN)