contd.......
This also emerges from a diagram of genetic distances between eight Indian and seven Eurasian populations, distances calculate on the basis of 16 Y-DNA haplogroups (Fig. 1). The diagram challenges many common assumptions: as just mentioned, five castes are grouped with the Chenchus; another tribe, the Lambadis (probably of Rajasthani origin), is stuck between Western Europe and the Middle East; Bengalis of various castes are close to Mumbai Brahmins, and Punjabis (whom one would have thought to be closest to the mythical “Aryans”) are as far away as possible from Central Asia! It is clear that no simple framework can account for such complexity, least of all the Aryan invasion / migration framework.
The next year, Mait Metspalu and fifteen co-authors analyzed 796 Indian (including both tribal and caste populations from different parts of India) and 436 Iranian mtDNAs.16 Of relevance here is the following observation, which once again highlights the pitfalls of any facile ethnic-linguistic equation:
“Language families present today in India, such as Indo-European, Dravidic and Austro-Asiatic, are all much younger than the majority of indigenous mtDNA lineages found among their present-day speakers at high frequencies. It would make it highly speculative to infer, from the extant mtDNA pools of their speakers, whether one of the listed above linguistically defined group in India should be considered more ‘autochthonous’ than any other in respect of its presence in the subcontinent.”
We finally jump to 2006 and end with two studies. The first was headed by Indian biologist Sanghamitra Sengupta and involved fourteen other co-authors, including L. Cavalli-Sforza, Partha P. Majumder, and P. A. Underhill.17 Based on 728 samples covering 36 Indian populations, it announced in its very title how its findings revealed a “Minor Genetic Influence of Central Asian Pastoralists,” i.e. of the mythical Indo- Aryans, and stated its general agreement with the previous study. For instance, the authors rejected the identification of some Y-DNA genetic markers with an “Indo- European expansion,” an identification they called “convenient but incorrect ... overly simplistic.” To them, the subcontinent’s genetic landscape was formed much earlier than the dates proposed for an Indo-Aryan immigration: “The influence of Central Asia on the pre-existing gene pool was minor. ... There is no evidence whatsoever to conclude that Central Asia has been necessarily the recent donor and not the receptor of the R1a lineages.” This is also highly suggestive (the R1a lineages being a different way to denote the haplogroup M17).
Finally, and significantly, this study indirectly rejected a “Dravidian” authorship of the Indus-Sarasvati civilization, since it noted, “Our data are also more consistent with a peninsular origin of Dravidian speakers than a source with proximity to the Indus....” They found, in conclusion, “overwhelming support for an Indian origin of Dravidian speakers.”
Another Indian biologist, Sanghamitra Sahoo, headed eleven colleagues, including T. Kivisild and V. K. Kashyap, for a study of the Y-DNA of 936 samples covering 77 Indian populations, 32 of them tribes.18 The authors left no room for doubt:
“The sharing of some Y-chromosomal haplogroups between Indian and Central Asian populations is most parsimoniously explained by a deep, common ancestry between the two regions, with diffusion of some Indian- specific lineages northward.”
So the southward gene flow that had been imprinted on our minds for two centuries was wrong, after all: the flow was out of, not into, India. The authors continue:
“The Y-chromosomal data consistently suggest a largely South Asian origin for Indian caste communities and therefore argue against any major influx, from regions north and west of India, of people associated either with the development of agriculture or the spread of the Indo-Aryan language family.”
The last of the two rejected associations is that of the Indo-Aryan expansion; the first, that of the spread of agriculture, is the well-known thesis of Colin Renfrew,19 which traces Indo-European origins to the beginnings of agriculture in Anatolia, and sees Indo-Europeans entering India around 9000 BP, along with agriculture: Sanghamitra Sahoo et al. see no evidence of this in the genetic record.
The same data allow the authors to construct an eloquent table of genetic distances between several populations, based on Y-haplogroups (Fig. 2). We learn from it, for instance, that “the caste populations of ‘north’ and ‘south’ India are not particularly more closely related to each other (average Fst value = 0.07) than they are to the tribal groups (average Fst value = 0.06),” an important confirmation of earlier studies. In particular, “Southern castes and tribals are very similar to each other in their Y-chromosomal haplogroup compositions.” As a result, “it was not possible to confirm any of the purported differentiations between the caste and tribal pools,” a momentous conclusion that directly clashes with the Aryan paradigm, which imagined Indian tribes as adivasis and the caste Hindus as descendants of Indo-Aryans invaders or immigrants.
In reality, we have no way, today, to determine who in India is an “adi”-vasi, but enough data to reject this label as misleading and unnecessarily divisive.
Conclusions
It is, of course, still possible to find genetic studies trying to interpret differences between North and South Indians or higher and lower castes within the invasionist framework, but that is simply because they take it for granted in the first place. None of the nine major studies quoted above lends any support to it, and none proposes to define a demarcation line between tribe and caste. The overall picture emerging from these studies is, first, an unequivocal rejection of a 3500-BP arrival of a “Caucasoid” or Central Asian gene pool. Just as the imaginary Aryan invasion / migration left no trace in Indian literature, in the archaeological and the anthropological record, it is invisible at the genetic level. The agreement between these different fields is remarkable by any standard, and offers hope for a grand synthesis in the near future, which will also integrate agriculture and linguistics.
Secondly, they account for India’s considerable genetic diversity by using a time- scale not of a few millennia, but of 40,000 or 50,000 years. In fact, several experts, such as Lluís Quintana-Murci,20 Vincent Macaulay,21 Stephen Oppenheimer,22 Michael Petraglia,23 and their associates, have in the last few years proposed that when Homo sapiens migrated out of Africa, he first reached South-West Asia around 75,000 BP, and from here, went on to other parts of the world. In simple terms, except for Africans, all humans have ancestors in the North-West of the Indian peninsula. In particular, one migration started around 50,000 BP towards the Middle East and Western Europe:
“indeed, nearly all Europeans — and by extension, many Americans — can trace their ancestors to only four mtDNA lines, which appeared between 10,000 and 50,000 years ago and originated from South Asia.” 24
Oppenheimer, a leading advocate of this scenario, summarizes it in these words:
“For me and for Toomas Kivisild, South Asia is logically the ultimate origin of M17 and his ancestors; and sure enough we find the highest rates and greatest diversity of the M17 line in Pakistan, India, and eastern Iran, and low rates in the Caucasus. M17 is not only more diverse in South Asia than in Central Asia, but diversity characterizes its presence in isolated tribal groups in the south, thus undermining any theory of M17 as a marker of a ‘male Aryan invasion’ of India. One average estimate for the origin of this line in India is as much as 51,000 years. All this suggests that M17 could have found his way initially from India or Pakistan, through Kashmir, then via Central Asia and Russia, before finally coming into Europe.”25
We will not call it, of course, an “Indian invasion” of Europe; in simple terms, India acted “as an incubator of early genetic differentiation of modern humans moving out of Africa.”26
Genetics is a fast-evolving discipline, and the studies quoted above are certainly not the last word; but they have laid the basis for a wholly different perspective of Indian populations, and it is most unlikely that we will have to abandon it to return to the crude racial nineteenth-century fallacies of Aryan invaders and Dravidian autochthons. Neither have any reality in genetic terms, just as they have no reality in archaeological or cultural terms. In this sense, genetics is joining other disciplines in helping to clean the cobwebs of colonial historiography. If some have a vested interest in patching together the said cobwebs so they may keep cluttering our history textbooks, they are only delaying the inevitable.
Refrences:If necessory