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Yes and no. Just by the time you get back 2000 years you have so many ancestors that you are related to everybody alive. There are no isolated human populations
by danieltillett 8y ago
Yes and no. Just by the time you get back 2000 years you have so many ancestors that you are related to everybody alive. There are no isolated human populations so everybody is related to everyone else.
Actually you only have around 1000 effective ancestors from that time as you don't inherit DNA from every ancestor.
- jobigoud 8y agoBut I feel this logic completely ignores "inbreeding" even if it's to the 5th, 10th or 20th degree. It's like seeing a human as the root of its ancestors tree, and saying that this tree is well balanced all the way to the nodes at depth 100 or so. But surely it's not a well balanced tree, more like a directed graph with many sideways connections. There could be multiple clusters, lineages, more or less narrow, coming from the bottom and reaching the top.
- danieltillett 8y agoYes this is true at the genealogy level, but because of the way meiosis works once you get back more than about 12 generation some of your ancestors don’t pass any of their DNA down to you.