Objective: To research the types, the distributions for gender and age, and the hereditary mode of the petaloid toenails.

目的探讨瓣状甲的类型、性别和年龄分布及其遗传方式。

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The hereditary mode of handedness or folding leg was likely the dominant heredity of single gene of autosome, and the right type of them was the dominant character.

利手和叠腿很可能均为常染色体单基因遗传，利手右型和叠腿右型分别为显性性状；

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The hereditary mode of rolling tongue or pointed tongue was the dominant heredity of single gene of autosome, and the can-rolling type or can-pointed type was the dominant character.

卷舌和尖舌均为常染色体单基因显性遗传，能卷舌型和能尖舌型分别为显性性状；

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