Southern ancestry a possibility?

["Dylan W.H. Sung" <mabr12@dial.pipex.com>]

It seems that all our recent (last couple of thousand years) written
materials point to the origin of the Hakka peoples as being of a Northern
extraction. However, previous writers to this forum have mentioned that
from haemaglobin studies (paraphrasing here) it shows a southern ancestry.

>From a language point of view, since a number of languages in the East
Asian continent are tonal langauges, and lumped together as Sino-Tibetan,
isn't a plausible suggestion that the ancestors of the Hakka could have
migrated north first many thousand of years previously to any written
records, usurping the natives, and establishing the roots of chinese
civilisation today? Later, with the influx of 'barbarians' from the north,
the Hakka fled south.

Dylan.