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oohh...that makes complete sense, now! this is by far one of the best explanations i've ever received! thank-you!!!

i read this & was interested if anyone could tell me WHY 2 gene copies of the tuffs in araucanas are lethal. i understand possibly something that would distort bone or organs... but as i understand it, the tuffs are just long feathers, right? so HOW does it effect something so vital it kills...