Breeding a ghost to a normal:
100% het ghost
Breeding a ghost to a pastel:
50% of the clutch is pastels, 50% of the clutch is normal ( the percentages aren't basted on the clutch, but per egg).
ENTIRE clutch is 100% het for ghost.
They will look like regular pastels but carry the gene for ghosts. If you raise up a female pastel het ghost you can breed it back to your male ghost and then have a chance for pastel ghosts (POGs, assuming your ghost is an orange ghost) or breed two of the pastels 100% ghost together for a chance at super pastel ghosts (SPOGs).