波斯貓
Cat fur length is governed by the "Length" gene in which the dominant form, "L", codes for short hair, and the recessive "l" codes for long hair. In the longhaired cat, the transition from anagen (hair growth) to catagen (cessation of hair growth) is delayed due to this mutation. A rare recessive shorthair gene has been observed in some lines of Persian cat (silvers) where two longhaired parents have produced shorthaired offspring.