| The incidence of polydactyly is the same in both sexes, with simultaneous polydactyly of the hands and feet present in about one third of cases. |
| True polydactyly more commonly occurs on the feet and may be present with malformation syndromes. |
| As mentioned cats have the pre-axial form of polydactyly, this means the extra digits are produced on the thumb side of the foot. |
| Accounts of polydactyly are mentioned as far back as the writings of Darwin, so there would appear to be nothing extraordinary about it. |
| This supports the theory that polydactyly is an incomplete dominant gene with variable expressivities. |
| Both males and females have a form of polydactyly and congenital heart disease. |
