Dr Heledd Iago sy'n egluro beth yn union ydi D.N.A? Dr Heledd Iago explains what exactly is D.N.A? Show more
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Dr Heledd Iago sy'n egluro beth yn union ydi D.N.A? Dr Heledd Iago explains what exactly is D.N.A? Show more
Mae Radio Cymru wedi bod yn darlledu rhaglenni ers 1977. Radio Cymru has been broadcasting to the nation since 1977.
