No, you can only tan so much once genetics decide what your skintone is.
Over thousands of years, natural selection would favour those with dark skin in an isolated light-skinned population living in the tropics. If Australia closed it's borders tomorrow, nobody got in and nobody got out, then in 5000 years or so the descendents of current (mostly white) Australians would be significantly darker, because natural selection would favour relatively darker-complexioned womens' birthrates. The opposite happens far from the equator, which is how European and Asian populations gradually developed lighter features.
will a white person turn black if they lived a lifetime in mid africa ?
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No, you can only tan so much once genetics decide what your skintone is.
Over thousands of years, natural selection would favour those with dark skin in an isolated light-skinned population living in the tropics. If Australia closed it's borders tomorrow, nobody got in and nobody got out, then in 5000 years or so the descendents of current (mostly white) Australians would be significantly darker, because natural selection would favour relatively darker-complexioned womens' birthrates. The opposite happens far from the equator, which is how European and Asian populations gradually developed lighter features.