Where Did My DNA Come From? by Michael Cummins, Wed 7 Sep '16

"Your DNA contains a record of your ancestors, but you aren’t a carbon copy of any one of them. The particular mix of DNA you inherit is unique to you. You receive 50% of your DNA from each of your parents, who received 50% of theirs from each of their parents, and so on. In the chart below you can see how the amount of DNA you receive from a particular ancestor decreases over generations. If you go back far enough, there is a chance that you inherited no DNA from a particular ancestor."

"Each of us carry unique pieces of DNA that can unlock our family’s story. If I had just used my DNA results to infer my genetic story, I would have missed out on a few pieces. So it’s important to get parents, siblings, aunts, uncles and even 1st cousins tested to help you do more with your DNA results."

- from blogs.ancestry.com

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