11,000 Generations Ago

All humans today share a single grandpa, circa 275,000 BCE. We know this because all humans alive today share our ancestor’s haplogroup A genes — from our Y chromosome. He was one of many thousands of men living in eastern Africa. Many paternal lines survived for many generations but ultimately over time all the other male lineages died out. Adam’s descendants met our Eve about 100,000 years later–about 4,000 generations later.

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