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NF2 is passed down through families in an autosomal dominant fashion. This means that if one parent has NF2, any child of that parent has a 50-50 chance of having it. The main risk factor is having a family history of the condition.
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A single, abnormal gene on one of the autosomal chromosomes (one of the first 22 "non-sex" chromosomes) from either parent can cause certain diseases. One of the parents will usually have the disease (since it is dominant) in this mode of inheritance . Only one parent must have an abnormal gene in order for the child to inherit the disease.
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