Sonoko-chan got another finger

  1. This is normal I got a friend with an extra fingers. Ok it's normal but rare at the same time. In other words it happens, both in animation by mistake and in reality by like genetics.

  2. Polydactyly can appear by mutation or by itself (autosomal). When it appears autosomal, it is a dominant trait. The same is true for achondroplasia (dwarfism).

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