Twisting tongue is the recessiveheredity of single gene of autosome, while the positive type is the recessive character.
翻舌为常染色体单基因隐性遗传，阳性为隐性性状。
2
It is a recessive hereditary disease of autosome to be deaf and dumb. it was analysed through heredity that reducing or preventing consanguineous marriage can reduce the deaf-mute's birth rate.