If we make skin and muscle cells when we heal cuts and heal/generate bones after breaking them, why wouldn’t we be able to grow a finger if one is cut off?
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Scientists have been doing some very interesting research on these things called homeotic (Hox) genes lately which appear to tell the body where to grow certain parts. For example, editing a fruit fly Hox gene can cause it to grow a leg in place of an antenna. So perhaps in a few decades our continuing knowledge of Hox genes in combination with future stem cell voodoo and gene therapy may actually allow for us to have this sort of control over our bodies. Long way away but we’re starting to figure it out. [https://www.khanacademy.org/science/biology/developmental-biology/signaling-and-transcription-factors-in-development/a/homeotic-genes](https://www.khanacademy.org/science/biology/developmental-biology/signaling-and-transcription-factors-in-development/a/homeotic-genes)
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