People who have neurofibromatosis will show varying degrees of the disease; this is because of the genetic principle of:

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Neurofibromatosis is an example of a genetic disorder that displays variable expressivity, meaning that the severity of symptoms can vary widely between individuals who carry the same genetic mutation. Penetrance refers to the proportion of individuals who inherit a disease-causing mutation and actually go on to develop symptoms, while dominance and recessiveness refer to patterns of inheritance for single gene disorders.

People Who Have Neurofibromatosis Will Show Varying Degrees of the Disease;