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August 2018
Genetic Genealogy
What is genetic genealogy?
How does MyHeritage help you with genetic genealogy?
How does MyHeritage help you use your genetic genealogy to
build your genealogy family tree?
Genetic Genealogy
Genealogical Family Tree = contains EVERY ancestor who had
a child who had a child …
Genetic Family Tree = contains ONLY ancestors who
contributed to your DNA (~ 5 to 9 generations back)
Genetic Family Tree is subset of Genealogical Family Tree
Genetic Genealogy
Genetic Genealogy
Inside each cell is an identical copy of the unique instruction
manual for YOU, written in DNA.
No one else’s DNA is exactly like yours. So if you know how to
read your DNA you can learn much about who you really are.
Genetic Genealogy
DNA carries the code for YOU
Eye color
Hair color
Height
Even whether you like the taste of Kiwi flat white coffee
Common DNA = common features
You look like your mother
You have your father’s nose
People who have never met your siblings know you’re related the instant they meet them, now you know why!
Genetic Genealogy
% Shared DNA Potential relationship
50% Parent, sibling, child
25% Grandparent, grandchild
Uncle/Aunt, Niece/Nephew
12.5% G grandparent, G Grandchild
G uncle/aunt, G niece/nephew
1st Cousin
Genetic Genealogy
Adapted from The University of Arizona Health Sciences
Picture of the Muellers
Genetic Genealogy
Amount of common DNA
Gender – males have Y chromosome females won’t
Age – if available, not in DNA itself
Quiz
50% DNA in common
Both female
30 years apart in age
Most likely = mother and daughter
Identify Relationship
Three DNA tests for genetic genealogy
MtDNA = Mitochondrial DNA which is passed exclusively from mother to child. Maternal material.
Y-DNA = Y-Chromosomal DNA reveals information about the male test-takers Y chromosome, exclusively passed from fathers to sons.
atDNA = Autosomal DNA reveals information about maternal and paternal lines.
DNA TESTING
Y-DNA & mtDNA
Father
Grandfather
Great Grandfather
Great Great Grandfather
Mother
Grandmother
Great Grandmother
Great Great Grandmother
BROTHER SISTER
Y-DNA Men Only
mtDNA Men & Women
Autosomal DNA tests confirm relationships with a high level of
accuracy for parent/child relationships and all relationships up
to the second cousin level.
Beyond second cousin additional contextual and genealogical
information is required to confirm the nature of the relationship.
DNA TESTING
Generations ago
People were born, married and died in the same region
Correlation between DNA and geographic location
Especially true for geographically isolated places - Ireland.
Geographic
Sometimes insular DNA inheritance wasn’t necessarily
geographic
Cultural
Jews - Mennonite Christians
Married within own groups for generations
Correlation between DNA and cultural identity.
Cultural
MyHeritage DNA test
Compare your DNA to our models of DNA from different
ethnicities
MyHeritage Ethnicity Estimates include 42 ethnicities.
MyHeritage DNA help’s you figure out which editions you got
from your parents.
ETHNICITY
DNA OVERVIEW
DNA OVERVIEW
DNA OVERVIEW
DNA OVERVIEW
DNA OVERVIEW
Shared DNA segments = DNA Matches may have inherited
from a common ancestor.
Triangulated segments = shared DNA segments all share with
each other
Chromosome Browser
DNA OVERVIEW
DNA OVERVIEW
DNA OVERVIEW
Genetic Genealogy
Genetic Genealogy
Theory of Family Relativity
Theory of Family Relativity
Investigators use DNA, genealogy database to ID suspect
in 1987 double homicide Originally published May 18, 2018 at 12:58 pm Updated May 22, 2018 at 5:20 pm
DNA OVERVIEW
Source: Snohomish County Sheriff’s Office Reporting by: Sara Jean Green Graphic by: Mark Nowlin/The Seattle Times
DNA, reverse genealogy used to catch alleged cold-case killer
1. DNA was collected from the crime scene 30 years ago.
2. Crime-scene DNA run through GEDmatch data bank.
3. Results indicate shared DNA with two second cousins.
Source: Snohomish County Sheriff’s Office Reporting by: Sara Jean Green Graphic by: Mark Nowlin/The Seattle Times
Source: Snohomish County Sheriff’s Office Reporting by: Sara Jean Green Graphic by: Mark Nowlin/The Seattle Times
DNA, reverse genealogy used to catch alleged cold-case killer 4. A genealogist reconstructed the family trees of the two cousins.
5. The reconstructed family trees lead to a suspect through common ancestors.
DNA OVERVIEW
