My slides are always available at https://slides.com/kittycooper
The test that most companies offer is for your autosomal DNA, your 23 pairs of chromosomes
Three types of DNA tests
An autosomal DNA test looks at the DNA inherited
from ALL your ancestors
Your autosomal DNA test results in about 700,000 lines of data
Your genome contains about 3.1 billion base pairs from each parent
only 700K of which are tested!
How can such a subset be useful?
The companies test the places that most often differ between people, known as SNPs
But the others can overlap greatly
even more than shown in the map
for example German and English
map source: MyHeritage
It turned out his parents had used a Jewish sperm donor
Stan knew he was of 100% German descent!
These were his results at Ancestry
Bill was one of the leaders of the Griffeth family History project but by testing his DNA he found that he was not a Griffeth
from Cece Moore's blog at http://www.yourgeneticgenealogist.com/2015/02/switched-at-birth-unravelling-century_27.html
Simplified version of the relationship chart from the ISOGG wiki (courtesy Dimario, Wikimedia Commons)
... it is very difficult to tell the difference between a half sibling and a nibling (an aunt/uncle/niece/nephew) relationship from the amount of matching DNA.
You will not match all your 4th cousins or even all your 3rds
but you will match all your 2nd cousins
and closer relatives
What percentage of your cousins will match your DNA?
My grandmother Anna Lee
My great-grandma Maren Wold, my brick wall
I looked in every churchbook in Drammen for her with no luck!
He had photos of Maren's parents Jorgen and Anna Wold
Then I heard from a possible 3rd cousin who said, " I think your great grandmother is the sister of my great great grandfather."
Maren was actually from Skoger,now a suburb of Drammen
Part of Skoger is in Vestfold county not the same county as Drammen (Buskerud)
Records from the churchbook for Skoger in Vestfold
ThruLines at Ancestry shows a nice chart of the relationship if you and your cousin both have family trees there linked to DNA tests
Do I really have to look through thousands of matches?
Handling all those cousin matches
(75cM and larger)
When you contact a possible cousin give them as much information as you can. Offer them photos and stories ...
Do not be disheartened by lack of responses, some rarely log in
Three types of personal DNA tests
Y test for father's father's line
mtDNA for mother's mother's line
Autosomal DNA test for all your ancestors
Deep ancestry - haplogroup
More recent ancestry - surname studies
By Chakazul, via Wikimedia Commons [GFDL (http://www.gnu.org/copyleft/fdl.html)
Mitochondria under the microscope
The Big Three:
* These companies do not take uploads of tests from elsewhere