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Continue to ChatThere is no gene "for" such unambiguous bits of morphology as your left kneecap or your fingernail. [...] Hundreds of genes contribute to the building of most body parts and their action is channeled through a kaleidoscopic series of environmental influences: embryonic and postnatal, internal and external. Parts are not translated genes, and selection doesn't even work directly on parts. - Stephen Jay Gould from https://whatsmyquote.com/quote/there-is-no-gene-for-such-unambiguous-bits-of-morphology-as-your-left-kneecap-or-your-fingernail-hundreds-of