Okay… Let me figure out the best analogy here…
Imagine your normal ball is a hotdog and your Banana is a bratwurst.
Take a vegetable peeler and peel a small piece out of both and then pop the piece from the bratwurst into the space you made on the hotdog. This, then, is your paradox
Now, that displaced bratwurst piece carries Banana genetics but it is basically just held in the skin of the animal. The gonads (i.e., testes or ovaries) are still 100% hotdog and so are genetically normal. Which means that when you breed this paradox, the only genetics it can pass on are normal.
Different take
Instead of a vegetable peeler, now you use a melon baller and carve a chunk out of both and then pop the chunk from the bratwurst into the hole you made on the hotdog. This is now your paradox
As above, that displaced bratwurst piece carries Banana genetics but now, instead of only being just “skin deep”, some of the organs in the animal are now carrying the Banana genetic payload. Say you the piece you cut/replaced is up by the “shoulders” of the snake. As above, the gonads (i.e., testes or ovaries) are still 100% hotdog and so are genetically normal. Which means that when you breed this paradox, the only genetics it can pass on are normal. However, if the piece you cut/replaced is down by the “hips” of the snake then maybe (maybe, maybe, MAYBE) the gonads (i.e., testes or ovaries) are now bratwurst instead of hotdog and, as such, are genetically Banana. Which means that when you breed this paradox, it has the possibility of passing on Banana.
Different take #2
Instead of a melon baller, you use an apple corer and core the center out of both and then pop the core from the bratwurst into the hollowed out hotdog. This is now your paradox (I am imagining that using a corer is a bit sloppy so you break the skin of the hotdog and parts of the bratwurst show through)
As above, that displaced bratwurst piece carries Banana genetics. Like the first scenario, you have a “skin deep” genotype/phenotype of normal but all/most of the organs in the animal are carrying the Banana genetic payload. In this case, the gonads (i.e., testes or ovaries) are certainly bratwurst instead of hotdog and, as such, are genetically Banana. Which means that when you breed this paradox, it has the possibility of passing on Banana.
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Does all of that make sense?