Congenital triangular alopecia may be categorized as a paradominant trait.

Abstract excerpt

The genetic basis of congenital triangular alopecia (CTA) is so far not clear. The following arguments are presented in favor of the notion that this may be a paradominant trait. CTA usually occurs sporadically but may exceptionally affect several members of a family. The lesion is usually unilateral but bilateral involvement may likewise occur. CTA has been reported in association with phacomatosis...

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