Dating dna compatibility

Someone who shares 1315 c M with you can only fall into Groups B or C, but someone who shares 100 c M could belong to Group E, F, or G, according to the DNA Detectives chart.

When you have a match in an overlap zone, the best approach is to consider the most likely group first.

It gives us an indication of which group of relationships is most likely to apply to a match who shares a specific amount of DNA. You may also be familiar with the Shared c M Project by Blaine Bettinger.

For example, a match sharing 750 c M with you is in an overlap zone, but they are far more likely to be in Group C (probability = 0.15, or 15% chance). This project compiles self-reported data from the genetic genealogy community for different relationships.

Join Now Wu K, Chen C, Moyzis RK, Nuno M, Yu Z and Greenberger E (2018) More than skin deep: Major histocompatibility complex (MHC)-based attraction among Asian American speed-daters Evolution and Human Behavior.

The one thing we genealogists probably want most from our autosomal DNA matches is something they can’t give us: an exact relationship prediction based on shared DNA alone.

To get around the problem, I approximated values for each curve using an online plot digitizer. relationship probabilities, Figure 5.2, Ancestry DNA Matching White Paper " data-medium-file="https://i2com/thednageek.com/wp-content/uploads/2017/01/Ancestry DNAs-Figure-5.2-Table-of-probabilities-2-1.png?

fit=183,300&ssl=1" data-large-file="https://i2com/thednageek.com/wp-content/uploads/2017/01/Ancestry DNAs-Figure-5.2-Table-of-probabilities-2-1.png? fit=549,901&ssl=1" class="aligncenter wp-image-403 size-full" src="https://i2com/thednageek.com/wp-content/uploads/2017/01/Ancestry DNAs-Figure-5.2-Table-of-probabilities-2-1.png? resize=549,901&ssl=1" width="549" height="901" srcset="https://i2com/thednageek.com/wp-content/uploads/2017/01/Ancestry DNAs-Figure-5.2-Table-of-probabilities-2-1.png? w=549&ssl=1 549w, https://i2com/thednageek.com/wp-content/uploads/2017/01/Ancestry DNAs-Figure-5.2-Table-of-probabilities-2-1.png? resize=183,300&ssl=1 183w" sizes="(max-width: 549px) 100vw, 549px" data-recalc-dims="1" / What does this tell us?

Worse, the more distantly related the group, the broader the range of shared centimorgans relative to the average and the more overlap there is with other groups.

This graph was taken from the Ancestry DNA Matching White Paper published 31 March 2016 (their Figure 5.2).

Unfortunately, they used a logarithmic scale, which is a great space saver but is intuitive to precisely no one.

Of course, the numbers don’t guarantee that the match is in Group C, but that’s where I’d start looking for the connection. Thus, it gives us both the extremes (maximum and minimum values) as well as histograms (bar graphs showing how common given centimorgan values are for each relationship).

The histograms are comparable to the colored lines on the Ancestry DNA graph.

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