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Old 31st October 2017, 10:03 PM
ltd-jean-pull ltd-jean-pull is offline
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Join Date: Jun 2016
Posts: 500
If C is not an X-match to F nor M, but F&M's daughters are an X-match then is very likely to be due to them being "identical by chance" on the X-chromosome.

There is a very good description of Identical By Chance in this article by Roberta Estes.

If you have a look at a male kit and a female kit on Gedmatch the females have several-fold more X-matches than the males. Because they have two X-chromosomes and males have one you'd expect them to have only twice as many X-matches as a male, so many of these X-matches can't be real.

Last edited by ltd-jean-pull; 31st October 2017 at 10:05 PM.
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