Polydactyly



Polydactyly is a congenital defect characterized by 'supernumerary fingers or toes. It is often hereditary. This trait is conditioned by the dominant mutant allele P, the effect of which will only be felt by some wearers. Polydactyly therefore belongs to disabilities with incomplete penetrance.

It occurs, for example, with trisomy 13. chromosomeu, which is called Patau syndrome.