People who have neurofibromatosis have a varying degree of the condition because of the genetic principle of:

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Expressivity is the extent of variation in phenotype associated with a particular genotype. If expressivity of a disease is variable, the penetrance may be complete but the severity of the disease can vary greatly. A well-known example of variable expressivity in an autosomal dominant disease is type 1 neurofibromatosis.

People Who Have Neurofibromatosis Have a Varying Degree of the Condition