HOW ACCURATE IS ANCESTRAL DNA TESTING?
I did some ancestral dna testing to confirm what i found during my genealogy research of my family. I have ancestors from almost every country you could possibly think of. I didn’t think people mixed like that back in those days.
All of our ancestors were nomads at one time. There have been numerous boundary changes in countries. Some countries in Europe did not exist until after WW1. German and Italy were not nations until the end of the 19th century. A country like England has been invaded and conquered by many people, Celtic, Romans, Germanic Angles,Saxons and Jutes, Danes and French speaking Normans. Now if you only had your Mitochondrial, it represents a very tiny part of your ancestry. If you get back to your 6xgreat grandparents, barring any duplicates, you are directly descended from 510 individuals. Of those 510 you get your Mitochondrial from only 8 leaving out 502 people. If you were a male you could get your Y done and would get it from only 8 people leaving out all total 494.
Most of your DNA is Autosomal but using Autosomal is very complicated in family history. It is used to determine the paternity of a female and also there is a company that uses it to match you with population groups throughout the world.
You get 23 chromosomes each from both parents. One each that determine a person’s sex has the Y & Mitochondrial. They are used in genealogy to match people with other family trees as they both go back in a straight line virtually unchanged.
However, your other 22 chromosomes each are made up of your Autosomal DNA which pretty much defines your genetic background. You get it 50-50 from both parents but when you get back to your grandparents, then it starts to vary. You get 50% from your paternal grandparents and 50% from your maternal grandparents but it will be bias in favor of your grandmother or grandfather in both cases. How this bias lands in you will vary with your other siblings unless you have an identical twin. Your appearance such as pigmentation, height, bone structure comes from your Autosomal DNA.
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