TC,
Sorry, I feel stupid. I found out what that means now, does this sound right?
Possible Het. - an animal from a known breeding that has either a 50% or 66% possibility of being "heterozygous" for a mutant gene.

A 66% possible het comes from breeding 2 heterozygous animals together: 50% of the offspring are heterozygous, 25% will be homozygous, and 25% will be wild-type. Of the normal appearing animals, 66% (or roughly 2 out of 3) will actually be heterozygous for the mutated gene.

A 50% possible het comes from breeding a heterozygous animal to a wild-type animal. All of the resulting offspring will be wild-type in appearance, but 50% of them will actually be heterozygous for the mutated gene and must be bred out to determine which animals are really hets.
http://www.newenglandreptile.com/genetics_intro.html

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