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Chez l'escargot Limnea peregra la coquille peut présenter un enroulement à droite ( dextre) de la coquille ou à gauche ( senestre). Soit les deux allèles s+ ( dextre) et s- ( senesyre). Un escargot E de cette espèce présente une phénotype [s+] avec un enroulement dextre de sa coquille. Ses descendants obtenus par croisement avec un escargot de phénotype et de génotype identiques présentent tous un enroulement senetre [s] de leur coquille. Quel est le génotype de l'escargot E ?
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