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RE: Question about Pure
This is the worst-case calculation. The best-case calculation is that all four grand-parents are homogeneous (AA) and the offspring has a 1:1 chance of being so, as well.
The full answer, when asked the odds of a given cat being homogeneous, when all we know is all parents and grandparents exhibit the trait value, is: "We don't know, but it's somewhere from 1:2 (50%) to 1:1 (100%)."
We can even work out all possible charts (there are 16, in all) and determine odds for each of the remaining 14. But, since we don't know the odds of one chart or another appearing, we can't work out the full odds and are still left with the statement "from 1:2 to 1:1" as the best we can do.
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