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On considère un gène à effet materbel nommé torso chez la drosophile, dont l'allèle muté noté torso- est récessif, et qui est requis pour le développement des structures antérieures et postérieures de la mouche. Un mâle de phénotype sauvage est croisé avec avec une femelle de génotype inconnu. Ce croisement produit 100% de larves dépourvus de structures antérieures et postérieures, et qui meurent au cours du DE. Quel est le génotype et le phénotype de la mère utilisée dans ce croisement ?
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