She explains that my sister and I, for example, may not have exactly the same DNA makeup. Obviously we have the same bloodline but we each got 50% of our DNA from Daddy and 50% from our mom. Nothing says we got exactly the same 50% from either one. So where, my DNA results showed a less than one percent European Jewish background, she may not have got that handed down to her. The video below here explains the results in a simple manner.
When I had received my DNA results, I was surprised at the percentages. The ethnicities however did not surprise me. I thought I was doing great going back through my generations. When Cowan did a little mathematical chart showing 10 generations back, it struck me how little I actually know and how much more there is to discover. The chart shows how many people you actually descend from in 10 generations (counting yourself as the first generation).
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Ten generations takes you back to your eighth great grandparents. Not counting yourself, that is 1022 people from whom you are descended. My numbers are also shown above. I am doing great through the fifth generation. After that however ... well item #1 on my Genealogy Bucket List!