I haven't finished testing this yet, but I thought I'd share some interesting things I'm seeing with the Tree of Emotion. Although the tree bears all the different emotion fruits, there seems to be a primary type - maybe the berry that the tree was grown from. I planted one of each kind of berry, and I have evolved the trees to Good. When my sim harvests, there is usually one fruit that seems predominant in that it there are 3-4 of that one, and 1-2 of each of the others. The predominant berries have a quality that matches the tree (Good in this case) but the others are all normal. I didn't pay attention when I planted them to which berry I planted where, but I do seem to have one tree primarily producing each berry, so I think the concept of the predominant berry is probably good.
Also, when I took cuttings and spliced them to faster-growing plants, each spliced plant bore only one of the emotion fruits. When I hover over those spliced plants, it says "Spinach and Museberries" or "Parsley and Razzleberries. Perfect berries are produced on the spliced plant, but when I planted a perfect museberry, the Perfect tree that grew from it bears Normal fruit. I have some more testing to do on this as well, but wanted to put this out there in case others have related findings to share.