While I agree with the above in theory, the Jag gene is still not fully understood. Just this year a (jag) sibling X sibling pairing produced 8 looking normals and one leucistic that died shortly after the egg was slit.
i'd have to disagree, by all accounts, the jag gene IS fully understood. there are several things that could explain an anomaly like that... monosomy is the most plausible in my opinion.
Colin Vestrand
long time keeper and breeder of carpet pythons and other snakes...