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
You are looking at it upside down. Instead of thinking about your family tree think about “Adam and Eve”. Someone was the first human and they had sex with an almost human, those genes spread to make more humans.
After the genes spread enough then there is enough diversity for cousins (4th, 5th, 6th) to never know each other and their kids can date without the gross out factor.
This means instead of being a real pyramid shape of “Adam and Eve” it’s shaped more like the Washington Monument. The lower down you are the more brinks above you(ancestors) that you have in common with other bricks at that level.
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