There's really no known genetics on the "morphs", I even prefer to call them patterns over morphs.
Basically, juveniles end up being a mix of whatever you put in from the adults, and sometimes some surprise colors or patterns come up. Say you have a male and a female harlequin of roughly the same color, you will probably get some harlequins out of them, but you also might get some plain flames and/or tiger patterned Crested geckos. I assume you know the morphs I'm talking about, if not, there is a good and commonly accepted guide here> http://www.forums.repashy.com/tutorials/11066-crested-gecko-morph-guide.html
One thing that does tend to stay in genetic lines for a while though is dalmatian spots, if one of the parents had them, the offspring probably will, and it will continue down the line.

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