Unless, of course, that genetic trait for which the animal is het is one determined by a gene that is dominant in nature to the wild type gene.
If the episkiastic gene (that which causes the bloodred pattern) is, as I believe, (at least partially) dominant to the wild type, then one would expect the het animals to show a range of episkiastic traits.
Of course het episkiastic animals DO usually show such traits, and it is very common to pick out an animal that is het for episkiastism from among a bag filled with normal babies. You might not get them all, and there may be a few "false positives" but you'll be able to spot the het animals purely on their own patterns more often than not.
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Darin Chappell
Hillbilly Herps
PO Box 254
Rogersville, MO 65742