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Genetic Ancestry in India
David Reich discusses the genetic landscape of India, highlighting the gradient of ancestry between ancestral North Indians and ancestral South Indians. He notes that this genetic mixture has been largely frozen for the past 2,000 to 3,000 years due to cultural changes, particularly the establishment of the caste system, which has prevented further mixing.
"when you look at genetic data from India almost everybody is on a gradient of ancestry with two poles what we call the ancestral North Indians and the ancestral South Indians with very few exceptions ..."
The Genetic Gradient of India
David Reich discusses the genetic diversity in India, highlighting the ancestral North and South Indian populations. He explains how the caste system has influenced genetic mixing, leading to a stable gradient rather than a collapse into a single genetic point. This phenomenon is linked to cultural changes that occurred 2,000 to 3,000 years ago, which effectively 'froze' the population's genetic diversity.
"when you look at genetic data from India almost everybody is on a gradient of ancestry with two poles what we call the ancestral North Indians and the ancestral South Indians with very few exceptions ..."
The Impact of the Caste System
Reich explains how the caste system has created a stable genetic gradient in India, contrasting it with the genetic collapse seen in Europe. He emphasizes that this stability is documented in ancient texts like the Rig Veda, providing a snapshot of Indian genetics that has persisted over millennia due to cultural practices.
"3,00 years ago and it froze because of cultural change the cultural change happens which locks in the cast system and people freeze and they stop mixing very much so what you see is instead of people ..."