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            <video:description>L’hémophilie, un caractère récessif lié au chromosome X, affecte la coagulation du sang. Une femme porteuse et un homme hémophile ont 50 % de chances d’avoir une fille hémophile. Cela est déterminé à l’aide d’un échiquier de Punnett, qui montre les combinaisons possibles des allèles des parents. L’échiquier de Punnett peut également répondre à d’autres questions, comme la probabilité d’avoir un fils hémophile ou un enfant non hémophile.&#xA;</video:description>
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