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I don't know the answer to that.  A lot of genetics stuff baffles me. I just know that, with pigeons, you could lose a lot of desirable features in a big hurry.  And because so much was recessive, breeders would inbreed to try and get a show-winning bird.  The results were that quite often a young pigeon that had wonderful attributes was so inbred that it couldn't reproduce or that it got sick easily.