"Only 5% of the Y chromosomes of the R1a-Z93 subtype that occurs at 100% frequency in the steppe population are present in the Swat Valley population. Therefore, it is assumed that women were incorporated there. But if we assume that this population was responsible for 30% of the Indian population, a possible proportion of steppe genes decreases to 6-7% and the proportion of male chromosomes become infinitesimal... However, with such a low male contribution, even for the population of the Swat Valley, language change is doubtful, so it is an almost unbelievable proposition for India... [A]gainst the background of the lack of archaeological and genetic data on mass migration to the region with a high population density, it is more logical to assume that the ancestors of the North Indians lived somewhere close to South Asia."
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Archaeology, Genes and Language: The Indo-European Perspective Stanislav Grigoriev, 2022
https://en.wikiquote.org/wiki/Genetics_and_archaeogenetics_of_South_Asia
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Genetics and archaeogenetics of South Asia
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