3.Why can some people roll their tongues but others can't?
Although we're often taught in school that tongue rolling is
due to genes, the truth is likely to be more complex. There is likely to be an
overlap of genetic factors and environmental influence. Studies on families and
twins have shown that it simply cannot be a case of just genetic inheritance.
Ask around - the fact that some people can learn to do it suggests that in at
least some people it's environmental fie a learned behavior) rather than genetic
(inborn).
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| (Image :https://ychef.files.bbci.co.uk) |
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