Polydactyly



Polydactyly is a congenital defect characterised by excessive fingers or toes. It's often hereditary. This situation is conditioned by the dominant mutant allele P, whose influence will only be felt by some carriers. Polydactyly is therefore a disability with incomplete penetration.

It occurs, for example, in the trisomnia of the 13th chromosome, which is called Patau's syndrome.