If you are talking about different ethnicity percentages, you would be absolutely correct. Each company has its own database and is building its own set of who belongs to what ethnicity. As more people are tested each company will also be updating their ethnicity percentages. For example, the first ethnicity estimate I got said I was almost 25% Irish. Later changes have narrowed that down to a much lower percentage, which means at corresponds much more closely to the genealogical research I have done.
The DNA matching of person to person does not change. A person’s DNA may change if they have had a bone marrow donation and in some other types of medical procedures. But company to company, the actual DNA with your chromosomes is going to be the same. I hope this makes sense and helps.
“If you are talking about different ethnicity percentages, you would be absolutely correct. Each company has its own database and is building its own set of who belongs to what ethnicity. As more people are tested each company will also be updating their ethnicity percentages. For example, the first ethnicity estimate I got said I was almost 25% Irish”
As the databases get bigger, the accuracy improves and the part of this is also the limitations are better understood, so there’s more understanding that a specific country can’t be specified.
So specific Ireland, for example, is decreased and assigned more broadly. In other words as they get more data it becomes more clear that certain DNA is shared among say Ireland, Britain and part of Europe so it can’t be aligned except broadly.
It affects Americans who are mixes of different backgrounds. For example a stretch of DNA might be common to a part of Ireland, Scandanavia and France. How to assign this to an American?