How accuarate are genetic DNA tests done on cheek cells?

Question

I'm talking about the tests done to find ancestors & native origins by swabbing the cheek

Answer 1

Very accurate. Check with www.familytreedna.com for more information. That is the site I used...

Answer 2

p= < 0.01

Answer 3

Mitochondrial DNA (mtDNA) testing

A person's maternal ancestry can be traced using his or her mitochondrial DNA (mtDNA). The DNA in the human mitochondria is passed down by the mother unchanged. One exception, which was linked to infertility, has been shown. Additionally, some people cite paternal mtDNA transmission as invalidating mtDNA testing[2], but this is not considered problematic in scholarly population genetics studies or genetic genealogy.

Y chromosome (Y-DNA) testing

A man's paternal ancestry can be traced using the DNA on his Y chromosome (Y-DNA) through Y-STR Testing. This is useful because the Y chromosome, like many European surnames, passes from father to son, and can be used to help study surnames. Women who wish to determine their paternal ancestry can ask their father, brother, paternal uncle, paternal grandfather, or a cousin who shares the same paternal lineage to take a test for them.