It means they are carrying a simple recessive gene to varying degrees. Either 100%, which means 1 parent was visually carrying the gene (That animal would be homozygous, by the way). For example, an albino bred to a normal female would produce all 100% het albino offspring. 2 100% hets bred together produces 66% hets. A 100% het bred to a normal produces 50% hets, and so on. But once you get under a 50% possibility of the animal carrying the trait, you're really taking a shot in the dark when breeding them together in hopes of getting visual homozygous animals from the breeding, in my opinion. Hope that helps some. Ryan.

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