What DNA Says About Aryan Invasion Theory-1

[Guest]

I read the Kashyap paper and is a good piece of work. Contour diagrams of Y chromosome haplogroups are very informative.
From the article
The caste populations of ‘‘north’’ and ‘‘south’’ India are not particularly more closely related to each other than they are to the tribal groups.
Genetic distances between Central Asia is similar for North caste, South Caste and Non North East tribals (NE tribes are treated separately), also same for distance from West Europe for the three groups. <!--emo&:clapping--><img src='style_emoticons/<#EMO_DIR#>/clap.gif' border='0' style='vertical-align:middle' alt='clap.gif' /><!--endemo-->
Conclusions:
It is not necessary, based on the current evidence, to look beyond
South Asia for the origins of the paternal heritage of the majority
of Indians at the time of the onset of settled agriculture. The
perennial concept of people, language, and agriculture arriving
to India together through the northwest corridor does not hold
up to close scrutiny. Recent claims for a linkage of haplogroups
J2, L, R1a, and R2 with a contemporaneous origin for the
majority of the Indian castes’ paternal lineages from outside the
subcontinent are rejected, although our findings do support a
local origin of haplogroups F* and H. Of the others, only J2
indicates an unambiguous recent external contribution, from
West Asia rather than Central Asia.
The current distributions of haplogroup frequencies are, with the exception of the O ineages, predominantly driven by geographical, rather than cultural determinants.
Ironically, it is in the northeast of India, among the
TB groups that there is clear-cut evidence for large-scale demic
diffusion traceable by genes, culture, and language, but apparently
not by agriculture. <!--emo&:beer--><img src='style_emoticons/<#EMO_DIR#>/cheers.gif' border='0' style='vertical-align:middle' alt='cheers.gif' /><!--endemo-->