Here's my version of the explanation:

There are three gene versions:
1. normal
2. lesser
3. slight (don't know what Ralph Davis is calling it, so I'll call it "slight" for convenience)

These three genes can make six gene pairs:
1. normal and normal = looks normal
2. normal and lesser = lesser platinum
3. normal and slight = looks normal
4. lesser and lesser = blue-eyed leucistic
5. lesser and slight = platinum (platy daddy)
6. slight and slight = ???

Actually there are several more mutant genes in the white snake gene complex. I would expect that pairing a slight with mojave or any of the other mutants in the complex would lighten them up a bit, just like pairing a slight with a lesser platinum makes a platy daddy.

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