Lactose intolerance is a disorder caused from the inability to digest the sugar lactose. It is not an allergy to milk, but rather is due to the lack of a functional enzyme known as lactase. It is a dominant genetic disorder. A couple, both of whom are lactose intolerant, have two children who have no problem digesting milk or milk products. What are the chances that a third child will be lactose intolerant?   0%   25%   50%   75%   100%

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