what chromosome is syndactyly found in
Both polydactyly and syndactyly can be caused by the presence of an autosomal dominant trait. An autosomal dominant trait is a gene that is not related to the chromosome that determines gender; therefore, it affects boys and girls equally.emographics. Syndactyly of the fingers is the most common malformation affecting the hand. It occurs in approximately one in 2,000 live births. Postaxial polydactyly, or an extra pinky finger, is the second most common malformation of the hand, occurring in approximately one in 3,000 births.