Scottish Fold
Various matings between curled cats and normal cats revealed a dominant inheritance of the curl gene. Sex linked distribution was not found. The mutant gene was designated as curl and is symbolized by Cu. Another mutation of the ear pinna was found in Scottish Fold cats. In these cats anomalies were rarely found when heterozygous, however in homozygous (FdFd) cats, animals suffer from dysplasia of the lower limbs and tail. So the question arises if homozygous curls (CuCu) could also be affected by cartilage formation defects and bone abnormalities. However observations of a CuCu cat over two years showed no sign of anomaly.