We are more like cheetahs than chimpanzees. That sounds brash, but it’s not far from the truth. Cheetahs today have only about 6,500 breeders, and in the past they dipped far lower — perhaps just a few hundred animals ten thousand years ago. Their DNA is so uniform that skin grafts from one cheetah anywhere on the planet can be accepted by any other.
Humans look massive by comparison — 8 billion alive, with maybe 4 billion of us of reproductive age. Yet the effective genetic diversity is shockingly small: it’s about what you’d expect if only 10,000 people had been breeding. Genetic evidence points to a time roughly 900,000 years ago when our ancestors may have been reduced to around a thousand individuals, and the population stayed small for a long stretch. Another squeeze seems to have occurred around 70,000 years ago.
Northern elephant seals tell a similar story. Hunted nearly to extinction in the 19th century, they were reduced to only a few dozen survivors on a single island. Today there are roughly 250,000, all descended from those two dozen.
So yes, physically we’re closer to chimpanzees. But genetically, we stand with cheetahs, elephant seals, and even bison — creatures that nearly vanished, then rebounded, but whose DNA still carries the thin, fragile code of survival.
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Now, This is Weird
We are more like cheetahs than chimpanzees. That sounds brash, but it’s not far from the truth. Cheetahs today have only about 6,500 breeders, and in the past they dipped far lower — perhaps just a few hundred animals ten thousand years ago. Their DNA is so uniform that skin grafts from one cheetah anywhere on the planet can be accepted by any other.
Humans look massive by comparison — 8 billion alive, with maybe 4 billion of us of reproductive age. Yet the effective genetic diversity is shockingly small: it’s about what you’d expect if only 10,000 people had been breeding. Genetic evidence points to a time roughly 900,000 years ago when our ancestors may have been reduced to around a thousand individuals, and the population stayed small for a long stretch. Another squeeze seems to have occurred around 70,000 years ago.
Northern elephant seals tell a similar story. Hunted nearly to extinction in the 19th century, they were reduced to only a few dozen survivors on a single island. Today there are roughly 250,000, all descended from those two dozen.
So yes, physically we’re closer to chimpanzees. But genetically, we stand with cheetahs, elephant seals, and even bison — creatures that nearly vanished, then rebounded, but whose DNA still carries the thin, fragile code of survival.
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