If You have 2 parents, 4 grandparents, 8 great parents, so if you go back 40 generations you’d have a supposed 1 Trillion ancestors, But only 100B humans have ever existed. Explain.
In: Biology
Basically, the same person represents multiple branches in the ancestral tree. This is called pedigree collapse. That also tells us that people who were alive a few thousand years ago are either the ancestor of almost everyone alive today, or no one.
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