In my experience it is really hard to tell. All of my hatchling snows look alike,but grow to be pink, green with various shades of yellow. If both the parents look alike there is a good chance that the offspring will look like them, but no guarantee. Several generations of line breeding would get it to the point that the majority are the same as the parents, but like I said there is no guarantee. Check out Kathy Loves website,I believe she has line breed one of her snow lines and says something about this subject.IMHO