You can breed siblings. Every time you see F2, those were produced by siblings, F3 are 2 generations of inbreeding. Etc. up to I think F5 is the furthest anyone has gone.

Any time you breed two unrelated animals the resulting offspring revert to F1 even if each was F5 in its respective bloodline.

The main issue is that you need to watch for deformed offspring. That was and still is an issue with many Albino boas, missing eyes, or other eye related issues. You can breed Albino X Albino even, but the bloodlines need to be distant.

Keep in mind that with any mutation, it is not necessarily just Pattern and/or Color that is affected. Any morph may have a number of other traits in its phenotype. This may be small heart size, short lifespan, big eyes, early maturity, large size, basically anything you can think of that is caused by genetics can be affected when a mutation is present. Some morphs do have different head shapes for example, that is a noticeable effect of the morph.
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