There is no standard way to do a punnet square. Personally I use a method that I didn't learn in any book, just go with whats easiest for me.
But im assuming your looking at NERD's site, they represent the morph genes as lower case letters and also note the classification for some reason in the punnet square for their dom/co-dom stuff.
But the reason the G is in there is because they are talking about double recessives. The C stand for the caramel's locus and the G stands for the hypo/ghost locus. The capital G means a normal gene in the hypo/ghost locus. so ccGG is two morph caramel genes in the caramel locus and two normal genes in the hypo/ghost locus.
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