polydactyly on human; rare abnormal characteristic causes by chromosome

abnormality adult affected anatomy anomaly arm biology body characteristic child congenital defect deformity dermatology diagnosis diagnostic disease duplication dysfunction feet fingers genetic genetics genomes hand hands health human hyperdactyly limb medical medicine mutation palm pathology people physical polydactylism polydactyly postaxial preaxial radial recessive sign skeletal symptom syndrome toes