When patients express variable forms of the same hereditary disorder this is due to:

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Penetrance refers to the proportion of individuals carrying a particular variant of a gene (allele) that also express an associated trait or disorder. When patients express variable forms of the same hereditary disorder, it can be due to differences in penetrance, meaning that not all individuals with the genetic variant will exhibit the disorder to the same degree, or at all.

When Patients Express Variable Forms of the Same Hereditary Disorder