Tags

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Please Note: The Examples shown here are the results of GedMatch One to One Comparisons, and should be taken as Examples Only. Your experience with a relationship of the same degree may vary. Please check tables such as those provided at ISOGG to determine what your relationship with your match may be.

Images are shown as “Graphics Only”, as the positions are not as relevant, and the current GedMatch default levels of 500SNPs and 7cM have been used.

Example Images

Same Person with Multiple Kits (or Identical Twins)
Estimated number of generations to MRCA = 1.0
All chromosomes show full green on the top and full blue on the bottom

Identical DNA

Parent to Child
Estimated number of generations to MRCA = 1.0
All chromosomes show bulk yellow with varying amounts of green or red on the top, and should be full blue on the bottom, sometimes with a very small break, but usually in one single segment.

Parent-Child

Full Siblings
Estimated number of generations to MRCA = 1.1 – 1.2
Individual Chromosomes can vary and include any, all or none of the following examples

  • long blocks of green and yellow on top, with full blue on the bottom

Full Siblings 1

  • Long blocks of green and yellow on top, with blue underneath those sections, interspersed with sections of red and yellow on top and grey on bottom

Full Siblings 2

Other Relationships

Relationship Estimated Number of Generations to MRCA
Full Siblings 1.1 – 1.3
Half Siblings
Aunt/Uncle to Niece/Nephew
Grandparent to Grandchild
1.3 – 1.6
Half Aunt/Uncle to Half Niece/Nephew includes 1.
First cousins 2.0 – 2.2
First cousins once removed 2.3 – 2.7
Second cousins Can include 2.8
Third cousins Can include 3.7
Third cousins once removed Can include 4
Fourth cousins twice removed Can include 3.9

Reminder: The Estimated Number of Generations to MRCA may vary from the above mentioned numbers in your situation.

Individual chromosomes can vary and include any of the following

  • long sections of yellow on top of blue, interspersed by sections of yellow and red on top of grey.

4

(as well as other examples already seen of this type)

  • Predominantly yellow and red on top of grey with only a small section of yellow on blue

4a

  • One or more chromosomes which share no DNA at all

4b

The more distant a relationship you have with your match, the more of this type of chromosome graphic you are likely to see.

 

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