From Leopard Gecko Wiki
A gene which is dominant shows their effect even if there is only one copy of that gene in the pair of alleles from their parents. When using a Punnent Square, dominant traits are shown by using a capital letter. An example of a dominant trait (Mack Snow) crossed with a Normal can be seen on the left.
Below you can see a list of Dominant, Incomplete Dominant, and Co Dominant morphs in Leopard Geckos