50%: Type 1 neurofibromatosis is autosomal dominant genetic condition caused by a mutation or deletion of, the nf1 gene. Only 1 deleted or mutated nf1 gene is required to affect individuals 50% of children might get nf11. Some case are very mild while others more severe. Very difficult to predict if child has nf1 the severity of the disease.
Answered 4/5/2014
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