There's virtually zero chance he carries Choco, so forget testing the b locus.
There's a slight chance that he carries yellow. You can either test the e locus, or you can breed him to a yellow, and see what comes out.
If he carries yellow, each pup has a 50/50 shot of being yellow.
And BTW, there is NOTHING wrong with black.
All Labs secretly want to be black. I can prove it.
If you take a yellow hunting, it will waller in the mud like a pig, trying to turn itself black.











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