Breeding dominate colors/genes are generally the easiest of all colors to work with. An example would be Dominant Opal. When mating a dominant gene to any color, that dominant gene can override all else. When mating Od (Dominant Opal) to a blue check for example, you will get a % of young in the nest that are Dominant Opal.
A bird CANNOT be split (carry) for a dominant gene.. it is either THAT color or not.
The added benefit of working with Dominant genes is that you can improve the "flying ability" or in the case of a showman "the type" much faster than when working with a recessive gene. Lets assume you purchase a Dominant Opal of average flying ability. One can then mate this new acquisition to your best flyer, some of which WILL be Od. Then in succeeding years mate these Od children back to your "good birds" and within a relative short time... you will have Od flyers that are a high % of your own blood that have flown well for you.